Modern batteries remain one of the most big problems for both producers and consumers. And the point here is not so much the potential risk of fire, but the gradual depletion of the power source itself. Therefore, one should not be surprised that with everyday charging, batteries can withstand a year or two of active use, after which their capacity drops catastrophically and it becomes problematic to use your favorite gadget. It is impossible to completely reanimate a dead battery, but you can extend the period of active use while you are busy looking for a replacement. This is what we will talk about today.

The recommendations below are designed for a technically trained user, therefore, if you do not know which side to approach the soldering iron, it is better to either contact the services service center, or immediately go to the store for a new battery.

Phone with a modern rechargeable Li-Ion battery

Method number 1

He can help in cases where long work gases begin to accumulate inside, as a result of which the battery swells and does not hold a charge well.

Necessary tools and materials: soldering iron, some epoxy, thin needle, flat heavy object for leveling.

As carefully as possible, we disconnect the battery case from the upper block with the sensor.

Separate the electronic sensor.

Under it there should be a cap, inside of which the control electronics are hidden. We carefully pierce it, for which a thin needle is well suited. Remember that with a damaged filling it will be impossible to reanimate the battery.

The most important moment. We put the battery on the table and press it with a press. Keep in mind: too much force can make the battery unusable, and its lack, on the contrary, will not lead to the desired result. It is also strictly not recommended to use a vise or similar devices for the purpose of repair.

When you're done, put some epoxy on the hole and solder the sensor.

Tools and materials for diagnosing a phone battery

Method number 2

He is not able to reanimate a battery with a significantly reduced resource, but it can slightly extend its life. You should not count on much, but a reanimated battery can provide power to a modern smartphone while you are looking for a replacement.

Necessary tools and materials: any power supply (5–12 V, current not less than 0.1 A), voltmeter or tester for voltage control, resistor (power not less than 500 mW, resistance from 330 to 1000 Ohm).

If you do not have a spare power supply, almost any complete one from active network equipment (switches, routers, modems) will do. First you need to make sure that the parameters of the current issued by them correspond to the required ones.

We release the contacts of the power supply and connect them to the dead battery: the “minus” of the PSU with the “minus” of the battery, and add a resistor to the “positive” line. Be sure to check the correct polarity of the connection with a multimeter.

When everything is done, connect the power supply to the network. The procedure time is no more than 2-3 minutes. If possible, control the process with a tester: the maximum allowable voltage is no more than 3.3 V.

A few important notes

Do not leave a problem battery unattended during repairs. Incidents of spontaneous combustion are not a theory, but a harsh reality.

Periodically check the temperature of the “client” with an external thermocouple, an electronic thermometer, or simply with your hand. If the surface feels hot to you, and not just warm, stop the repair immediately.

Do not use excessive charging currents. The maximum that you can afford is 50 mAh. This parameter is calculated as follows: divide the PSU supply voltage by the resistor capacitance. For example, if the first parameter is 12 V, and the second is 500 ohms, then the charging current will be 24 mAh.

Instead of a resistor, you can use a standard 80mm computer fan.

In order to avoid spontaneous combustion, it is also recommended to control the initial charge of the recovered battery.

Method number 3

The technique is controversial and doubtful, but, according to reviews on specialized forums, it helps some users, because the responsibility for possible Negative consequences lies on you.

Necessary tools and materials: a working refrigerator.

Remove the battery that does not show signs of life from the smartphone and put a plastic bag, which should be put in the freezer for 20-30 minutes.

Remove it from the device, let it warm up to room temperature, and then charge in the usual way.

Method number 4

Harmless, but ineffective method of resuscitation. But if it seems to you that the battery in your smartphone is completely out of order, then why not try it?

Required tools and materials: smartphone with a standard charger.

Bring the battery to a full discharge (when the phone no longer turns on). Any resource-intensive game or AnTuTu utility can help with this.

Fully charge the battery to the 100% mark.

Repeat steps 1 and 2 several times.

Method number 5

Almost all professional electricians will consider the following procedure sacrilegious, but it has helped many users of old batteries.

Necessary tools and materials: razor blade, thin screwdriver, glue "moment".

We remove the battery from the phone.

Peel off the sticker with technical specifications.

We cut off the top plastic cover as much as possible, behind which the control electronics is hidden.

We find the main contacts.

For a moment we close them with any metal object.

Glue top cover and let it dry.

Once again, we remind you that none of the above methods of resuscitation guarantees a 100% result, and all responsibility falls entirely on your shoulders. But if the battery is completely dead, and the purchase of a new one is postponed for several days, it's worth a try. But if you rarely pick up a soldering iron and consider yourself a humanitarian, it is better to seek help from a friend who understands the topic.

Video instruction

Battery failure - quite common problem on modern devices. After a long discharge, the battery may stop responding when the power adapter is connected. In addition, after using a smartphone for 2-3 years, its capacity is significantly reduced, and it takes longer to charge. The following describes how to revive the phone's battery.

There are quite a few recovery methods, but if your phone is more than one year old, none of them will bring long-term results. Faults can be divided into two main categories:

1. Physical aging of the device and loss of battery capacity.
2. “Deep discharge” of a smartphone, making it impossible to use a regular charging adapter due to insufficient voltage on the controller.

Modern lithium batteries cannot be recycled in the same way as old alkaline batteries. If the battery has already worked out its life and has seriously lost its capacity, it is recommended to replace it with a new one. The following describes how to restore a completely dead phone battery.

Important! All methods give only a short-term positive result, and best solution in most cases will be the purchase of a new module.

How to "push" the phone's battery

If gadget for a long time was in the off state, it may stop turning on and respond to the connection to the outlet. It probably happened deep discharge", and the power controller cannot start charging. You can correct the situation with the help of improvised means.

To carry out the repair, you will need the following tools:

• Multimeter - to check the current and input voltage.
• An adapter from any device capable of outputting voltage from 6 to 12 volts.
• Suitable power supplies from other smartphones, tablets and routers.
• A tuning resistor with a power of at least 1.5 W.
• Soldering iron, duct tape, clamps and copper wire.

If all the necessary tools are in place, follow the instructions:

• Output "plus" and "minus" from the power supply. First, strip the wire braid, then connect one wire (plus) inside the connector, and the other (minus) to the outside. Secure with tape.
• Connect the other ends of the wire to the battery itself, observing the polarity. For a while, you can also fix them with electrical tape.
• The trimming resistor should be connected to the positive wire.
• Connect the resulting structure to the network and regularly check the current with a multimeter. 50 mA is usually sufficient for charging.

It is also possible to perform a similar procedure using a “charge-frog”. Finding such a device is not difficult in electronics stores and markets. The output current, as a rule, is 200-500 mA, but this is quite enough for charging. Instructions for working with "frogs" are different for each model. This method can slightly extend the life of an old battery or “push” a discharged module.

Video

We revive the battery with the help of cold

Using a refrigerator to restore a lithium battery is useless. alkaline nickel cadmium batteries they can “add” a little in capacity, but this type of elements is not installed on any modern smartphone.

Storing the battery in the refrigerator will completely discharge it, but will definitely not help start the charging process. If the element is pulled out of the phone, store it at room temperature on a dry surface.

Important! hypothermia Li-ion elements will cause them to fail and void the manufacturer's warranty.

Recovery by contact closure

If all the above methods did not help, try shorting the battery contacts using a metal object.

• Remove the sticker from the front of the battery (near the contacts for connecting to a smartphone) using a flat screwdriver.
• Close the two contacts for 1 second using tweezers or any other metal object.
• The functionality of the element will be restored for a while.

Important! This method works only in some cases. Use it only when all else fails.

Using another battery for recharging

In some situations, recharging with a “donor battery” helps.

1. Find any 9 volt battery, a roll of electrical tape and wire.
2. Connect the non-working element to the "donor", observing the polarity. Secure the wires with electrical tape.
3. Wait 5-10 minutes until charging in progress. If everything is connected correctly, the battery will heat up slightly.
4. Disconnect the non-working module from the "donor" and install it in your smartphone.

Release of gases from a swollen battery

If the batteries swell, they should be replaced with new ones as soon as possible. A bad battery can damage the display and even bend the board, not to mention fire. However, if you pierce a defective battery and release gases, you can extend its life for a while.

• Disconnect the controller with sensors from the case.
• Using a thin needle, pierce the end side of the jar from the side of the contacts.
• Gently press the battery with a heavy object, trying to release the gas, but not damage the case. Use an object larger than the body of the damaged module.

Battery Calibration

• Wait until the smartphone is completely discharged and turns off.
• Connect the gadget to the outlet without turning it on. Usually, the current battery level is displayed on the screen, even if Android is not loaded.
• Wait full charge to 100%, then disconnect the device from the power supply for 3-5 minutes.
• Put your phone back on charge. Please note that the charge level will be a couple of percent below the maximum.
• Repeat the procedure starting from point 4. The battery is considered calibrated when, when connected, after a few minutes of inactivity, the level is 100%.

Conclusion

Smartphone and tablet batteries lose their original capacity over time. After a long stay in a discharged state, a process of “deep discharge” occurs, from which a “frog charger” or standard set tools.

Cooling repair is possible for alkaline batteries, but absolutely useless for Li-ion modules. Closing contacts is a method that is effective only in a number of situations. Once every 2-3 months, it is recommended to calibrate the module - this will help slow down the degradation lithium cells and increase service life.

Video

4 ways to restore a car battery

Batteries - stable source constant voltage, they are indispensable in individual designs and devices. But of course there are no eternal things on earth, and with batteries, time passes and they are no longer suitable for use, what should I do? Throw it away and buy a new one? You can of course, but it's better to try to repair them. You can find a sea of ​​​​batteries on the market different types capacitance and voltage. Mainly use acid alkaline and lithium batteries. Today we will talk about ways to repair such types of batteries as lead. Acid batteries - more commonly referred to as lead-helium batteries. Two lead plates are immersed in sulfuric acid, one plate is positive, the other is negative. These batteries are most commonly used in automotive technology and flashlights. They have a relatively short lifespan. They can be repaired (restored) in several ways.

First way multiple charge low current rating with small time intervals between charges. By the end of the first and subsequent charges, the voltage on the battery gradually increases, and it stops accepting a charge. During the break, the electrode potentials on the surface and in the depth of the mass of the plates are equalized, while the denser electrolyte from the pores of the plates flows into the interelectrode space and reduces the voltage on the battery during temporary breaks. During a cyclic charge, as the battery gains capacity, the density of the electrolyte begins to increase. When the density becomes normal, and the voltage on one section reaches 2.5-2.7 volts (the nominal value of each can is 2 volts), the charge is stopped. Repeat this cycle 5-8 times. The charging current is ten times less than the battery capacity, let's say the battery has a capacity of 1000mA / h, then the charge current should be between 80 and 100 milliamps.

The second way to restore acid batteries is to replace the electrolyte. Drain the electrolyte from the battery and flush the battery hot water repeatedly. Next, take 3 teaspoons of soda and dilute in 100 ml of water. We boil water and immediately pour boiling water into the battery, wait 20 minutes and drain. This process we repeat several times. Then rinse the battery 3 times with hot water. This recovery method is very convenient to use for car batteries. In the last stage of work, we pour new electrolyte and charge the battery for 24 hours, the repaired battery is charged once a day for 10 days, the charge lasts 6 hours, the charger parameters are 14-16 volts, the charge current is 10 amperes (no more).

The third way is reverse charge. To do this, you need a powerful voltage source (a welding machine, for example), the voltage of the charger is 20 volts, and the current strength is 80 amperes or more, open the plugs of the cans and charge them only back - we attach the plus of the power source to the minus of the battery, and the minus of the power source to the plus battery. At the same time, the battery will boil, but do not pay attention, we charge for 30 minutes, then drain the electrolyte, rinse with hot water and pour in a new electrolyte. We take an ordinary Charger with a current of 10-15 amperes and charge the repaired battery for 24 hours, just do not mix up the polarity, since the factory positive pole will already be negative, and the negative positive, we will talk about the repair and restoration of alkaline and lithium batteries in the next article, stay with us - Artur Kasyan (AKA).

Fourth way is different high efficiency and efficiency (the battery is restored in less than an hour). A discharged battery is pre-charged. The electrolyte is drained from a charged battery and washed 2-3 times with water. An ammonia solution of Trilon B (ETHYLENEDIAMINETETRAACETACETE sodium), containing 2 weight percent Trilon B and 5 percent ammonia, is poured into the washed battery. The time of desulfation with a solution is 40-60 minutes. The process of desulfation is accompanied by the evolution of gas and the appearance of small splashes on the surface of the solution. The cessation of gas evolution indicates the completion of the process. In case of strong sulfation, the treatment with the solution should be repeated. After treatment, the battery is washed at least 2-3 times with distilled water, then filled with an electrolyte of normal density. A flooded battery is charged with a charging current up to rated capacity according to the instructions in the passport. Regarding the preparation of the solution, it is necessary to contact enterprises with chemical laboratories. Store the solution in a dark place in a vessel with a hermetic lid to prevent evaporation of ammonia. http://www.handiman.ru/
December 18, 2012, 09:58
battery repair,
battery recovery

What are the ways to restore the battery mobile phone?

The phone battery is a key element of a mobile phone, without which it stops working. It is thanks to the battery that the phone is called mobile. At the same time, the battery is the most weak point smartphones. , which are installed in modern phones, serve 2-4 years. Their resource is 400-500 charge-discharge cycles. A smartphone that constantly goes online, plays games, watches videos, requires charging almost every day. As a result, battery life is significantly reduced. A battery can lose up to 15-20% of its nominal capacity per year. This article provides some tips on how to restore your phone battery.

If you want to restore the lithium battery of a smartphone to a long period, then only repacking will help here.

The procedure is to replace the battery bank with a new one. Here you will need to purchase a similar can, the process will result in a full-fledged battery repair. It makes sense to do such things if you need a battery for an outdated phone model. Otherwise, it's easier to buy a new battery.

This article will look at ways to restore the phone's battery for a short period.

How can you "push" the phone's battery?

If the battery has been lying idle for a long time, then it can be restored in this way. Some miracle should not be expected here, but the method will help restore the battery to such a level that it can turn on the phone. What could it be useful for? For example, you changed your phone, but abandoned the old one. Battery voltage dropped below allowable limit, and the controller blocked it. And in memory there were contacts and valuable photos. Not to buy new battery, you can use this method to turn on your smartphone.

What might be needed?

• Power supply from a modem, router, another phone, tablet. At the output, it should provide a voltage of 6 to 12 volts;
• Copper, wires, clamps, soldering iron, electrical tape;
• Building resistor. Power must be at least 0.5 watts;
• Multimeter. For measuring current and voltage.

We also recommend reading the material about.

What do we have to do?

• Using the wires, bring out the plus and minus from the power supply connector. To do this, strip the braid, insert one inside the connector (plus), and attach the second to the outer part (minus). And fix the wires with electrical tape;
• Connect the other ends of the wires to the terminals of the battery bank. To do this, you need to disassemble it and connect to the plus and minus banks already behind the controller. You can do this with appropriately sized clamps or by soldering;
• A tuning resistor is installed in the gap of the positive wire.

To start, set the current to about 50 mA. To do this, you need to calculate the resistance. To do this, you need to use Ohm's law. The resistance is calculated using the formula R = U / I. If the power adapter you are using has an output of 12 volts, then R will be equal to 12 / 0.05. This gives 240 ohms. It is necessary to include in the circuit such a resistor with such resistance or trimmer. The latter is much more convenient because it allows you to change the value on the fly.

After assembly, the power adapter is plugged into an outlet. Measure the voltage at the terminals at regular intervals. It should gradually increase. Ideally, you need to bring the voltage to a value close to the battery rating. If the process is too slow, try increasing the current by lowering the resistance. But be careful, monitor the temperature of the battery and its condition. If the battery is very hot or swollen, unplug the power supply immediately.

Do not leave the battery on charge unattended. The bank is charged directly, which means that the controller will not stop the process automatically. Lithium batteries cannot be overheated. It is fraught with fire. It is better to charge the battery to a certain level and try to install it in the phone. If the controller turns on the battery, then the remaining charging process is best done in the phone.

You can try to "push" the battery automotive battery. Connect the negative contacts of the can and the car battery and the positive wire to the telephone battery. Then, with the other end of the positive wire, make quick touches on the positive terminal of the car battery. In this case, sparking may even be observed.

If you need, read the material at the link provided.

Touches must be done quickly so that the wire does not stick. After 3-4 touches, measure the voltage battery. Do the procedure until the tension stops growing. After that, continue charging in your phone.

Using cold to restore batteries

Quite often, this method is found on forums as a recommendation for restoring the phone's battery. But apparently, we are talking about alkaline Ni─Cd and Ni─MH batteries. The fact is that dendrites are formed in such batteries during operation. It turns out that part active elements in the electrodes are excluded from the process. As a result, the battery capacity decreases. In such a situation, this method can help restore the battery.

Read also the article about.

As a result of cooling in the refrigerator, the dendrites become brittle. Subsequent light impact or shaking destroys them. Thus, it is possible to partially restore the lost capacity of an alkaline battery. But it's about alkaline batteries. For phone batteries lithium type, such a procedure can be not only useless, but also harmful.

If you want to know why, read the article at the link provided.

All batteries have an expiration date, with numerous charge-discharge cycles and many hours worked, the battery loses its capacity and holds a charge less and less.
Over time, the capacity of the battery drops so much that its further operation becomes impossible.
Probably many have already accumulated batteries from uninterruptible power supplies (UPS), alarm systems and emergency lighting.

Many household and office appliances contain lead- acid batteries, and regardless of the battery brand and production technology, whether it is a regular serviced car battery, AGM, gel (GEL) or a small flashlight battery, they all have lead plates and acid electrolyte.
At the end of operation, such batteries cannot be thrown away because they contain lead, basically they are waiting for the fate of recycling where lead is extracted and processed.
But still, despite the fact that such batteries are mostly "maintenance free", you can try to restore them by returning them to their previous capacity and use them for some more time.

In this article, I will talk about how restore 12v battery from UPSa on 7ah, but the method is suitable for any acid battery. But I want to warn that these measures should not be carried out on a fully working battery, since on good battery capacity recovery can only be achieved the right way charging.

So let's take a battery this case old and discharged, pry off the plastic cover with a screwdriver. Most likely it is point glued to the body.

Lifting the lid, we see six rubber caps, their task is not to maintain the battery, but to bleed the gases formed during charging and operation, but we will use them for our purposes.

We remove the caps and in each hole, using a syringe, pour 3 ml of distilled water, it should be noted that other water is not suitable for this. And distilled water can be easily found in a pharmacy or at a car market, in the most extreme case, melt water from snow or pure rain water can come up.

After we have added water, we put the battery on charge and we will charge it using a laboratory (regulated) power supply.
We select the voltage until some values ​​\u200b\u200bappear charging current. If the battery is in poor condition, then the charging current may not be observed, at first, at all.
The voltage must be increased until the charging current appears at least 10-20mA. Having achieved such values ​​​​of the charging current, you need to be careful, since the current will increase over time and you will have to constantly reduce the voltage.
When the current reaches 100mA, there is no need to reduce the voltage further. And when the charge current reaches 200mA, you need to disconnect the battery for 12 hours.

Then we reconnect the battery for charging, the voltage should be such that the charging current for our 7ah battery is 600mA. Also, constantly observing, we maintain the specified current for 4 hours. But we make sure that the charging voltage, for a 12-volt battery, is no more than 15-16 volts.
After charging, after about an hour, the battery needs to be discharged to 11 volts, this can be done using any 12-volt light bulb (for example, 15 watts).

After discharging, the battery must be charged again with a current of 600mA. It is best to do this procedure several times, that is, several charge-discharge cycles.

Most likely, it will not be possible to return the nominal one, since the sulfation of the plates has already reduced its resource, and besides, there are other harmful processes. But the battery can continue to be used in normal mode and the capacity for this will be enough.

About rapid wear batteries in uninterruptibles, it was noticed the following reasons. Being in the same case with an uninterruptible power supply, the battery is constantly subject to passive heating from active elements (power transistors), which by the way heat up to 60-70 degrees! Constant heating of the battery leads to rapid evaporation of the electrolyte.
In cheap, and sometimes even some expensive models UPSs do not have thermal charge compensation, that is, the charge voltage is set to 13.8 volts, but this is acceptable for 10-15 degrees, and for 25 degrees, and sometimes much more in the case, the charge voltage should be a maximum of 13.2-13.5 volts !
It's a good idea to move the battery out of the case if you want to extend its life.

It also affects the "constant small under charge" by an uninterruptible power supply, 13.5 volts and a current of 300mA. Such recharging leads to the fact that when the active spongy mass inside the battery ends, a reaction begins in its electrodes, which leads to the fact that the lead of the down conductors on (+) becomes brown (PbO2) and on (-) it becomes "spongy".
Thus, with a constant charge, we get the destruction of current leads and the "boiling" of the electrolyte with the release of hydrogen and oxygen, which leads to an increase in the concentration of the electrolyte, which again contributes to the destruction of the electrodes. It turns out such a closed process that leads to a rapid consumption of battery life.
In addition, such a charge (recharge) with a high voltage and current from which the electrolyte "boils" - converts the lead of the current leads into powdered lead oxide, which crumbles over time and can even close the plates.

With active use (frequent charging), it is recommended to add distilled water to the battery once a year.

Top up only on a fully charged battery with control of both electrolyte level and voltage. In some case, do not overfill, it's better not to pour it because you can’t take it back, because by sucking out the electrolyte, you deprive the battery of sulfuric acid and, as a result, the concentration changes. I think it is clear that sulfuric acid is non-volatile, therefore, in the process of "boiling" during charging, it all remains inside the battery - only hydrogen and oxygen come out.

We connect to the terminals digital voltmeter and with a 5 ml syringe with a needle, pour 2-3 ml of distilled water into each jar, at the same time shining a flashlight inside to stop if the water is no longer absorbed - after pouring 2-3 ml, look into the jar - you will see how the water is quickly absorbed, and the voltage on the voltmeter drops (on fractions of a volt). We repeat topping up for each jar with pauses for soaking for 10-20 seconds (approximately) until you see that the "glass mats" are already wet - that is, the water is no longer absorbed.

After topping up, we inspect whether there is an overflow in each battery bank, wipe the entire case, put the rubber caps in place and glue the lid in place.
Since the battery shows about 50-70% charge after topping up, you need to charge it. But charging must be carried out either with an adjustable power supply or with an uninterruptible power supply or a standard device, but under supervision, that is, during charging it is necessary to observe the condition of the battery (you need to see the top of the battery). In the case of an uninterruptible power supply, for this you will have to make extension cords and bring the battery out of the UPSa case.

Place napkins or plastic bags under the battery, charge up to 100% and see if electrolyte does not leak from any can. If suddenly this happened, stop charging and remove smudges with a napkin. Using a napkin soaked in a soda solution, we clean the case, all the cavities and terminals where the electrolyte has got in order to neutralize the acid.
We find the jar where the "boiling" came from and see if electrolyte is visible in the window, we suck off the excess with a syringe, and then carefully and smoothly fill this electrolyte back into the fiber. It often happens that the electrolyte after topping up is not evenly absorbed and boils up.
When recharging, we observe the battery as described above, and if the "problem" battery bank starts to "poured out" again during charging, excess electrolyte will have to be removed from the bank.
Also, under inspection, at least 2-3 full discharge-charge cycles should be done, if everything went well and there are no smudges, the battery does not heat up (light heating does not count when charging), then the battery can be assembled into a case.

Well, now let's take a closer look cardinal methods of resuscitation of lead-acid batteries

All the electrolyte is drained from the battery, and the insides are washed first a couple of times with hot water, and then with a hot soda solution (3 tsp of soda per 100 ml of water), leaving the solution in the battery for 20 minutes. The process can be repeated several times, and finally thoroughly rinsed from the remnants of the soda solution - a new electrolyte is poured.
Then the battery is charged for a day, and after, for 10 days, for 6 hours a day.
For car batteries with a current of up to 10 amperes and a voltage of 14-16 volts.

The second way is reverse charging, for this procedure you will need a powerful voltage source, for car batteries, for example, a welding machine, the recommended current is 80 amperes with a voltage of 20 volts.
They do a polarity reversal, that is, plus to minus and minus to plus, and for half an hour they “boil” the battery with its native electrolyte, after which the electrolyte is drained and the battery is washed with hot water.
Then a new electrolyte is poured in and, observing the new polarity, they are charged with a current of 10-15 amperes for a day.

But the most effective method done with chem. substances.
From a fully charged battery, the electrolyte is drained and, after repeated washing with water, an ammonia solution of Trilon B (ETHYLENEDIAMINETETRAACENETIC Sodium) containing 2 weight percent Trilon B and 5 percent ammonia is poured. There is a process of desulfation for 40 - 60 minutes, during which gas is released with small splashes. By the cessation of such gas formation, one can judge the completion of the process. In case of particularly strong sulfation, the ammonia solution of Trilon B should be refilled, removing the spent one before that.
At the end of the procedure, the inside of the battery is thoroughly washed several times with distilled water and a new electrolyte of the desired density is poured. The battery is charged in the standard way to the nominal capacity.
Regarding the ammonia solution of Trilon B, it can be found in chemical laboratories and stored in sealed containers in a dark place.

In general, if you are interested, the composition of the electrolyte produced by Lighting, Electrol, Blitz, akkumulad, Phonix, Toniolyt and some others is water solution sulfuric acid (350-450g per liter) with the addition of sulfate salts of magnesium, aluminum, sodium, ammonium. Gruconnin's electrolyte also contains potassium alum and copper sulphate.

After recovery, the battery can be charged normally of this type way (for example, in UPSe) and not allow a discharge below 11 volts.
Many uninterruptible power supplies have a "battery calibration" function with which you can carry out discharge-charge cycles. By connecting a load of 50% of the UPS maximum at the output of the uninterruptible power supply, we launch this function and the uninterruptible power supply discharges the battery to 25% and then charges up to 100%

Well, in a very primitive example, charging such a battery looks like this:
A stabilized voltage of 14.5 volts is supplied to the battery through a wire variable resistor high power or through a current stabilizer.
The charge current is calculated using a simple formula: divide the battery capacity by 10, for example, for a 7ah battery it will be - 700mA. And on the current stabilizer or using a variable wire resistor, you must set the current to 700mA. Well, in the process of charging, the current will begin to fall and it will be necessary to reduce the resistance of the resistor, over time, the resistor knob will come all the way to its initial position and the resistance of the resistor will be zero. The current will further gradually decrease to zero until the voltage on the battery becomes constant - 14.5 volts. The battery is charged.
For more information on the "correct" charging of batteries, see

light crystals on the plates - this is sulfation

A separate "bank" of the battery was subjected to constant undercharging and, as a result, was covered with sulfates, its internal resistance grew with each deep cycle, so that, during the charge, it began to "boil" before anyone else, due to loss of capacity and removal of electrolyte into insoluble sulfates.
The plus plates and their grids turned into powder in consistency, as a result of constant recharging by an uninterruptible power supply in the "stand-by" mode.

Lead-acid batteries other than automobiles, motorcycles and miscellaneous household appliances, where only they are not found in flashlights and watches, and even in the smallest electronics. And if you got into the hands of such a "non-working" unmarked lead-acid battery and you do not know what voltage it should give out in working condition. This can be easily recognized by the number of cans in the battery. Look for protective cover on the battery case and remove it. You will see gas bleed caps. by their number it will become clear how many "cans" this battery is.
1 bank - 2 volts (fully charged - 2.17 volts), that is, if cap 2 means a 4 volt battery.
A fully discharged battery bank must be at least 1.8 volts, you can’t discharge it below!

Well, in the end I will give a little idea, for those who do not have enough money to buy new batteries. Find companies in your city that deal with computer equipment and UPSs (uninterruptibles for boilers, batteries for alarm systems), agree with them so that they do not throw away old batteries from uninterruptibles, but give them to you, possibly at a symbolic price.
Practice shows that half of AGM (gel) batteries can be restored if not up to 100% then up to 80-90% for sure! And this is a couple more years of excellent battery life in your device.