The battery is dead, what should I do?

Rechargeable batteries

Information site about energy storage devices

How to charge a completely dead battery

The purpose of the battery is to start the engine and power the on-board electrics when the engine is stopped and the generator is not producing current. The generator, while moving, supplies energy to the battery, and the battery helps the generator cope with the load. The operation of two energy sources in pairs is the key to stable voltage in the network. If the battery is dead, you can recharge it with a generator. How to return the working capacity? Charge using a network charging station.

When does a car battery need to be charged?

The installed battery is monitored for open circuit voltage, which should be 12.5 V. The operating voltage is measured at the terminals after the battery is charged on the bench or using a booster. The density of the electrolyte in all banks must be the same, corresponding to the operating conditions of the vehicle. Measurements are taken with the engine running at a shaft speed of 1500-2000 rpm and the high beams on. It is normal if the mains voltage is 13.8 - 14.5 V. Both undercharging and overcharging have consequences for the technical condition of the battery.

For low-maintenance and hybrid batteries, periodic monitoring of the density and electrolyte level is mandatory. Maintenance-free batteries have no caps, are sealed, and can be used as long as they hold a charge. What is important for them is the stability of the network voltage and the absence of discharge to zero.

How to properly charge a dead battery

The charger for a car battery is represented by AC rectifiers. These can be devices that allow regulation of the charging current or voltage. How long will it take to charge a completely dead battery?

If the charging station operates at a constant charging current, a battery with a capacity of 60 A/h is fully charged within 20 hours with a constant current of 6 A.

At a constant current value during the charging period, the voltage increases, which leads to abundant gas release from the electrolyte. Therefore, the supplied direct current is reduced stepwise twice, when the voltage reaches 14.4 and 15 V. That is, control of recharging a dead battery needs monitoring and adjustment.

The method of charging batteries at a constant voltage does not require constant monitoring of the process. The target voltage is set, and the current varies from 40 amperes at the beginning to almost zero at the end of recharging. The recharging time for a completely discharged battery will be 24 hours. But maintenance-free batteries will not receive a full charge. 14.5 V corresponds to 90-95% of the battery capacity.

How long to charge a dead car battery?

The energy spent on starting the car, servicing the alarm system and other on-board systems is replenished by the generator. The voltage in the relay network is regulated by a regulator, which is designed for 13.9 - 14.3 V. The battery is not fully charged and periodically requires recharging. After being idle, the remaining battery charge may not be enough to start the engine. How to determine how long to charge a dead battery?

To charge a dead car battery, you will need to determine the degree of discharge of the battery by the voltage in the open circuit. In a serviced or hybrid battery, the residual charge can be determined by the actual density of the electrolyte.

The charging time is set by dividing the charging capacity by the charging current, which should be less than 10% of the charging capacity. The efficiency of the electrochemical reaction is assumed to be 50%. This means that the calculated time should be doubled.

Before charging, a dead car battery should be prepared for recharging - cleaned of dirt and acid deposits on the terminals. The plugs of low-maintenance batteries need to be unscrewed, the density and level of electrolyte in the banks must be checked.

To quickly charge a dead battery, you can use a mode with a current of 8 A for 3 hours and another hour with a current of 6 A. How long should you charge the battery so as not to harm it? It is optimal to use a current of 2-3 A, eliminate overheating, overcharging, and create the best conditions for long-term operation of the charger.

You can charge a dead car battery locally, but you need to assemble the circuit correctly. You should disconnect the negative wire and break the line so that the increased voltage does not harm the on-board network.

Work related to charging batteries is considered dangerous. An acid battery is filled with a caustic concentrated acid solution. Properly prepare and charge the battery while wearing rubber gloves in a ventilated area. Gases released from cans are explosive. There is no need to bring a lighter or open flame to the hole.

The battery is dead, how to charge without charging

If the energy of a dead battery after a long period of inactivity is not enough to set the car in motion, charging from external sources will be required. This could be recharging from the battery of another car or using an external energy source in the form of a battery or booster. You may have to use a pusher. How to apply the first pulse charge, in the future the generator will add energy, but after an emergency drop in charge, it is necessary to take measurements and charge the dead battery with a network station.

A battery that has reached zero is charged with a current of 2-3 A. If the voltage at the terminals does not increase within several hours, the battery needs to be replaced.

We invite you to watch a video on how to properly charge a car, the devices used, and how to properly prepare the equipment for restoration.

What to do if the battery in your car is completely drained

How to tell if your car battery is completely discharged

An unpleasant surprise for many car owners is the unexpected discharge of the battery. The battery runs out of power infrequently, but always at the wrong time, and you need to be prepared for this.

How do you even understand that your car’s battery is dead, and distinguish this from other possible faults? Let's sort it out in order.

The primary signs of a dead battery in a car are:

When you turn the key in the ignition switch, you will hear muffled and drawn-out sounds instead of the usual cranking of the starter, or lonely clicks if the battery is low.
The battery check light came on (in the car it is shown on the dashboard as a picture of the battery).
All vehicle lights dim or go out completely.

You can also check the voltage level of the battery. For this purpose, special devices are used: a load fork, a multimeter or a voltmeter. Their contacts are connected to the battery terminals. Ideally, the value should not be lower than 11 V. For accuracy, measurements should be taken with and without load.

And the last way to understand that the battery is discharged is to check the electrolyte level. This method is not always applicable, since the battery can be discharged either in the presence or absence of liquid. But if there is no electrolyte inside the battery, then you will not start the car. It is not possible to check the presence of fluid in all batteries. In many, the battery filler necks are sealed by the manufacturer. If you find that the battery jars are empty, you can top them up with distilled water yourself.

What to do if the car battery is dead

Many drivers are faced with the question “what to do if the car battery is dead?” There are several ways to start a car with a dead battery. Depending on the circumstances (reason for discharge, location, availability of tools and the ability to ask for help from other drivers), you can choose the option that is suitable for you.

Use a jump charger

This is the easiest way. Using a jump charger, you can either simply charge the battery or start a car with a discharged battery. To do this, you need to connect this mechanism to the network and set 15–20 A. Connect the positive wire to the positive terminal of the battery, and the negative wire in the area of the starter to the unit. After that, start the car and disconnect the device.

If you don’t have a special device at hand, you can use the help of other drivers by asking them to “light a cigarette.” To do this, you will need high-voltage wires with fastenings for alligator clips. What do we have to do:

First of all, we are looking for a car with a charged battery. Moreover, if you have a 12 V battery, then the donor must also have a 12 V battery. The same applies to 24 V - they need a 24 V battery. Also, it is better to start a diesel unit from a diesel engine, and a gasoline unit from a gasoline one.
The donor car must be driven as close to yours as possible to run the wires. After which both cars should be turned off.
We connect two batteries with wires: plus to plus, minus to minus. In this case, we first connect the positive (red) wire, and then the negative (black), in sequence - from the donor to the discharged battery.
We start the donor car, let it run for a few minutes, after which you can start your car. You should let both machines run for 10 minutes to give your battery time to recharge.
We remove the jumper wires, after which it is recommended to let your car run for 20–30 minutes so that the battery is better recharged.

There is another way to “light it” if you don’t have any wires. To do this, you need to remove your battery and replace it with the battery from the donor car. Then we start the car and wait for its speed to reach the normal rate. Next, without turning off the engine, we remove someone else’s battery and install our own in its place. For such an operation you will need a standard set of wrenches, just remember that the batteries must be the same.

Start "from the pusher"

Your battery is completely discharged - what to do if there is neither a charger nor wires nearby? In this case, we apply the “pusher” method.

You will need either a second car or a couple of buddies willing to push the car. Let's consider the first method. The second car fits its rear bumper to your front bumper. Both cars are connected by a cable. After this, you need to get behind the wheel, depress the clutch pedal, engage second gear and indicate readiness (blink the headlights or sound the horn). When the car starts moving, smoothly release the clutch pedal and press the gas. The car will start soon.

Keep an eye on the distance between cars and remember that the brakes often do not work well when the car is turned off.

The second method is almost identical to the first, but instead of another car, your comrades are the driving force. You need to take into account their physical capabilities and give them time to accelerate the car a little.

Spin the drive wheel

What to do if the battery is dead, and there are no high-voltage wires or a starting device in the car, and there is not a single car ready to tow you? A jack and a towing cable (rope, etc.) can help here. Using these simple devices, we spin the drive wheel (the principle of operation is the same as that of a manual starter). We proceed as follows:

We lift the car with a jack, freeing the drive wheel.
We engage fourth gear.
We wrap a cable or rope, at least 5 meters long, around the wheel counterclockwise.
We begin to sharply pull on the end of the rope, spinning the wheel.

This method is acceptable for cars with an engine capacity not exceeding 1.5. In addition, it can only be used in warm weather.

Reasons for a completely discharged car battery

What to do if your car battery is completely dead? To begin with, it is worth understanding the reasons for this phenomenon. By identifying them, we can take the right repair action, avoid mistakes and save time. So, what can cause your battery to drain:

The battery life has expired. With a modern battery, it reaches 3–4 years. After this point, it is recommended to replace the battery to avoid unpleasant surprises.
There is a problem with the generator. The most common damages include breakdown of the voltage regulator, diode bridge and bearing. These troubles can be eliminated by simply replacing components.
Open circuit in the battery charging circuit. As a rule, these are oxidized wiring elements or a break. Also, the network may be open if your dashboard light goes out, indicating whether the battery is charging.
Loose alternator belt. You should periodically check the degree of tension. If the belt is loosely tensioned, the battery will not have enough energy to recharge, which will gradually discharge the battery. You also need to pay attention to its visual condition. If the belt looks frayed and cracked, then this indicates the likelihood of an imminent break.
Leaving the power supply switched on. Often drivers simply forget to turn off lights, radios and the like. And if you leave the car for a long time, then even the alarm can drain the battery.
Low temperatures. Frost and high humidity have a detrimental effect on the service life and quality of the battery. What to do if the battery does not hold a charge due to the cold? There are ways to preserve heat in winter, for example, you can cover the battery with a blanket made of special fabric. You also need to make sure that the battery does not have time to discharge, periodically recharging it and bringing it home at night in the cold. By applying such measures regularly, you will not have to think about what to do if your car battery is completely discharged.
High humidity. It accelerates battery contamination, which also leads to accelerated discharge.

In general, so that a discharged battery does not become an unpleasant surprise for you, it is better not to take it to extremes and carry out routine diagnostics and replacement of tired components in a timely manner.

The battery is completely discharged, what should I do?

Car batteries keep everything in your car running, from starting the car to running all the other electronics. And it is clear that if the battery is empty, the car simply will not start. But in some cases, the battery is either already completely discharged or is still subject to rapid restoration. You need to know what to do if the battery is completely discharged.

Overview of the device

Lead acid batteries were invented more than 150 years ago. Since its invention, the design has remained virtually unchanged. The box contains lead plates (minus) and lead dioxide (plus). A dielectric is poured between them. It prevents the plates from shorting.

Packs of plates are placed in electrolyte. As a rule, there are 6 packs (cans) in a standard battery. Each produces a voltage of about 2.1 Volts.

The battery is quite durable and resistant to mechanical damage. But it has a weak point - the electrolyte. Due to sulfuric acid, when deeply discharged, the battery becomes inoperable. But the second component of the electrolyte, distilled water, has a negative effect on the battery when recharging.

What happens during a discharge depending on time and during a deep discharge in general

The discharge and charge of the battery can be characterized by the battery voltage. Everyone is accustomed to thinking that at maximum charge this parameter is 12V, but this is not so. 12.7V is considered normal. The indicator acquires this value when fully charged.

A strong discharge is a decrease in voltage to 10.5-11V. With such indicators, the car will not be able to start. A discharge to zero is characterized by a complete absence of voltage.

Deep discharge of the battery negatively affects the condition of the battery. During the discharge, sulfuric acid is absorbed from the electrolyte. During this process, it settles as salt on the plates. Accordingly, the lower the voltage in the battery becomes, the more salt is deposited. The density of the electrolyte drops significantly.

A deep battery discharge is the minimum battery threshold. There is simply nowhere to discharge further. To minimize the negative consequences, you need to charge the battery as soon as possible. This will help remove salts from the plates.

When charging, the density will increase to normal. The distillate will already be absorbed, and the acid content will increase.

Important! As a rule, after a deep discharge, salts do not completely dissolve when charging. It turns out that the plates have virtually no contact with the electrolyte, which prevents the battery from performing its functions.

It is better to carefully monitor the battery discharge and try not to drop the voltage to 11 volts. This is a minimum; at low values, the deposition of a salt layer begins.

Possible causes and consequences

The reasons for a strong discharge can be:

current leakage;
incorrectly working generator;
long-term parking.

Devices that are not turned off also drain the battery greatly. For example, motorists often forget to turn off their headlights. The battery will be completely discharged overnight.

The consequences of such discharges are the deposition of salts on the plates and a drop in the density of the electrolyte. This, in turn, will lead to the device being damaged. So, deep discharge has a very negative effect on lead-acid batteries, and in particular, with a cycle it consumes about 3 percent of the capacity.

Is it possible to restore

After a deep discharge, you can restore the battery by removing salt deposits from the positive plates. This can be done in two ways:

If crystallization has occurred to the maximum, you can clean it manually. This is done by pulling out the plates and removing the salt from them. Then you need to use a new electrolyte and charge the battery. This method is very complex and requires maximum care. There is a risk of further destruction of the plates.
You can use a special plate desulfator. As a rule, such a chemical liquid instantly removes the layer of salt on the lead plates, and the battery begins to hold a charge.

Important! When working with batteries, you should use protective gloves and goggles. Electrolyte contains sulfuric acid, which can cause chemical burns if handled carelessly.

What to do if the battery is completely discharged

Before you start taking any measures to start the battery, it is worth checking its performance. The fact is that if it is completely discharged, then no measures will revive it on the spot. It is quite easy to determine its complete discharge if the car battery is of a modern type and there are charge indicators on it. As a rule, green means it is fully charged, black indicates that it is simply discharged, and white is shown if the battery is completely discharged or unfit for further use.

If the battery does not have a special indicator, you will have to check it manually. This can be done using the following methods:

Check the voltage at the terminal using a voltmeter, multimeter or load plug. A working battery should have readings in the range of 12.6-12.9 V, while a simply discharged battery should have readings that are one less. If the numbers obtained are even lower, then the battery has been deeply discharged.
Afterwards, you need to measure the level and density of the electrolyte in the battery. This is only possible if the battery is serviceable. The density of the liquid should be between 1.25 and 1.29 g per cm3. The electrolyte level should not be below the minimum risk. If there are no such marks, the main thing is to ensure that the battery plates are covered with electrolyte by 1-2 cm. You can also add distilled water to the battery to the required mark.

Advice! If the battery shows no signs of life at all, then you should not try to restore its functionality on the spot. This procedure is possible, but requires a lot of time.

If the battery is completely discharged, the car will not be able to start. No amount of effort will make the battery work without proper preparation.

How to charge a very low battery

You should not simply charge a battery that is very discharged, much less leave it to recharge overnight. In this case, replenishing the charge must be done according to the rules and nuances. If all aspects of the delicate matter are fully completed, the likelihood that the battery will become operational again will increase.

Immediately before charging, you must open all covers and remove the terminals. Connect the plus and minus, and only then turn on the electricity.

Important! Disabling proceeds in reverse order. Those. First the current supply is removed, then the minus is removed and then the plus.

In conventional lead acid batteries, the charging current is set to 1/10 of the capacity. For example, when charging a battery at 50 A*hour, with a tolerance of only 5 amperes, the charging time will be about 10 hours. It is also important that all caps are removed from the battery during charging.

You should not charge faster with a higher current, this will lead to overheating and boiling of the electrolyte. And this, in turn, will affect the quality of the plates, they will warp and the battery will become completely inoperable.

If the battery is maintenance-free, you should take a charge current of no more than 2.5% of the total capacity. And the charging time can be increased to 40 hours or more.

In addition, the quality of the charge of a battery that has completely lost its charge also depends on the device with which restoration work will be carried out. As a rule, most conventional chargers for this type of battery have a built-in charge current regulator. Some devices also have a declining charging mode. Such functions help prevent battery overcharging.

But, you should carefully check that the charger is not of the type that is aimed at quickly charging the battery. They are very powerful and can instantly kill an already weak battery. It is better to do everything slowly, this will ensure the quality of work is high and without errors.

If the battery is not completely discharged: how to start a car with a discharged battery

It happens that the battery was almost able to start the car, but after some small actions it stopped responding to subsequent attempts. This most likely indicates that the battery is not completely discharged. This outcome is the most favorable, since in this case there is an opportunity to correct the situation and start the car with such a battery.

Charger or spare battery

You can recharge the battery quite simply and quickly if you have a battery charger with you. Or, for example, a spare battery. The main thing is to set aside 20-30 minutes for charging and the car will start again. You can also simply change the battery or recharge a failed one from a spare one.

Advice! To be always prepared for technical imperfections, it is recommended to always have a battery charger in the trunk. It’s even better if you have a spare battery with you. It doesn't have to be new; it can be a reconditioned car battery. It won't last long, but the time gained will be enough.

It is worth understanding that recharging the battery from a portable charger every time is harmful to the condition of the battery. It is also better to pay attention to how long the battery holds a charge after this. If it lasts at least 3-7 days, then everything is in order and the battery will last for some time. Otherwise, it is worth starting to carry out a full diagnosis to find out the reason why the battery is quickly discharged, or what is preventing it from producing current.

Plant with pusher

A simple and often used way to start a car with a dead battery is to push start it. But this method is best used only in cars with a manual transmission.

In the case of automation, this method can only be used in extreme cases. In this type of design, lubrication occurs when the engine is already running, and when starting dry, breakdowns can occur.

You need to push the car and try to start it while driving. It is better to do this on level ground, since here the car will not be able to roll down in case of failure.

Power supply from the battery of another car

It is possible to charge the battery using an external one as a power source. This power supply is universal and suitable for any type of car. But you should understand that even this common method can fail due to new electronics. In older cars, this method will not cause any problems.

The charging proceeds as follows:

The car with the donor battery must be parked close to discharged. You should not park cars close to each other, this can trigger the formation of a closed circuit. Access to the batteries in both cars opens.
Using crocodiles, connect the red cable to the plus of a full battery, with the other end in the same place in the discharged battery.
Connect the black wire first to the negative of a working battery, the second to the engine block or to the grounding point on the chassis.
The donor car must operate for about 1 or more minutes.
When the empty car begins to show signs of life and the engine starts to run smoothly, you need to start gradually removing the cables from the batteries. This is done in strictly reverse order.

Important! A spark may occur when connecting the wires. It is necessary to ensure that there is nothing unnecessary or adhering debris at the point of contact. And also, so that the cable itself does not touch the moving parts of the car. It is prohibited to touch the car body and smoke.

Some motorists simply put someone else's battery into their car to replace a discharged battery. This should not be done under any circumstances. Such an action will lead to the settings being lost in one car, and the injector on the second may simply fail.

The new battery is dead. why and what to do?

The newly purchased battery went to zero after two weeks of parking (the lights were off, there was an alarm).
What could be the reason and what to do with the battery and for the future?

I took the radio panel due to the battery being undercharged..

Modified by zzzerg (19:58 09/28/2013)

what car and reason for replacing the previous battery?
an alarm in a certain mode can easily drain the battery

If the battery is calcium, the problem may be a pipe, these strongly do not like discharge to zero, they practically do not recover. bring it to the seller, in theory they can check and give an opinion whether it is a factory defect or not. When you bought it, did they show you its condition using a loading fork?

Palestinian 09.28.2013 19:58 writes:
what car and the reason for replacing the previous battery?
an alarm in a certain mode can easily drain the battery

99% - signaling. It happened that the car sat for almost a month, the battery died, then it happened again for 2 weeks, but it was possible to start it. The third time I didn’t dare, I removed both terminals on the battery and within 2 weeks it started the second time.

Daewoo Lanos. I blame the alarm system - something has clearly changed in it lately: it beeps somehow differently

On Monday I’ll try to go to the seller in the morning, the problem is that I was going to travel far on Monday. Damn, I went to check the car. I hope to figure it out myself on Sunday.

When purchasing, we checked it with a device - everything was ok. installed, started the car perfectly.

The previous battery was replaced because it was old and started to malfunction - when checked, it turned out to be dry.
Perhaps they said the generator is too strong. BUT after purchasing a new one, the generator did not work: the car was parked for 2 weeks.

Briefly about how to restore a 18650 battery after a deep discharge

In general, there can be only two situations:

The battery seems to work, but discharges very quickly.
The battery is dead and doesn't want to charge at all.

First situation: loss of capacity

In the first case, the battery capacity has dropped and you will have to come to terms with it. Complete restoration of batteries after a deep discharge is impossible (this applies to all Li-ion batteries: 18650, 14500, 10440, mobile phone batteries, etc.). Even theoretically, it is impossible to restore the capacity of a lithium battery.

A decrease in capacity is an absolutely normal process. This happens during every charge/discharge cycle, no matter how properly the battery is used. However, if during operation deep discharges are often allowed or, conversely, long-term recharges (more than 500%), then the rate of capacity loss can increase significantly.

Recent studies have shown that lithium batteries lose their capacity even if they are not used at all. For example, during normal storage in warehouses. According to research, the battery loses approximately 4-5% of its capacity per year.

Second situation: does not want to charge

Now let's consider the second case - the battery is not charging.

This situation usually occurs when a device (phone, tablet, MP3 player) has been left idle for a long time with a discharged battery. Or if the lithium battery has been subjected to deep cooling.

In principle, there should be no problems with charging such batteries. Inside each battery - between the battery bank itself and the terminals that we see - there is a protection module that disconnects the battery from the terminals when the voltage drops below a certain threshold. Outwardly, this manifests itself as a complete absence of voltage at the battery output (zero volts).

In fact, as a rule, at this moment the voltage on the bank itself is about 2.4-2.8 Volts.

All modern protection modules are designed in such a way that even if the battery is blocked from further discharge, it can still be charged. This happens thanks to a parasitic diode built into the switch on the field-effect transistor. Here is a typical diagram of a 18650 battery protection module:

Since during a deep discharge only transistor FET1 closes, while the second MOSFET remains open (passes current in both directions), the charging current quietly flows from the positive terminal of the battery through FET2, the parasitic diode inside FET1 to the negative terminal.

If the battery is blocked due to overload (short circuit in the load), the protection module also blocks the FET1 transistor. It makes no difference whether the protection was triggered by overdischarge or short circuit. The result is the same - open transistor FET2 and closed field switch FET1.

Thus, during a deep discharge, the lithium-ion battery protection board does not in any way interfere with charging the battery.

The only problem is that some chargers consider themselves too smart and when they see that the voltage on the battery is too low (and in our case it will be zero), they believe that some unacceptable situation has occurred and completely refuse to issue a charger current.

This is done solely for security purposes. The fact is that if the battery has an internal short circuit, charging it becomes dangerous - it can overheat and swell (with all sorts of special effects like leaking electrolyte, squeezing out the tablet cover, etc.). If there is a break inside the battery, charging it becomes completely pointless. So the logic of operation of such smart chargers is quite clear and justified.

Read on to learn how to trick charging and restore functionality of a lithium battery after a deep discharge.

How to force it to charge?

In essence, restoring lithium-ion batteries after a deep discharge comes down to returning it to normal operation. You must understand that this in no way compensates for the loss of capacity (this is impossible in principle).

In order to still force a too cunning charger to charge our very low battery, it is necessary to ensure that the voltage on it exceeds a certain threshold. As a rule, 3.1-3.2 Volts are enough for the charger to consider the situation normal and allow charging.

You can only increase the voltage on the battery using a third-party (more stupid) charger. This is popularly called “pushing” the battery. To do this, simply connect an external power supply to the battery terminals, while limiting the maximum current.

For our purposes, any cell phone charger will do. Most often, modern chargers have an output in the form of a USB socket and, accordingly, produce 5V. All we have to do is select a resistor that limits the charge current.

The resistor's resistance is calculated using Ohm's law. Let's take the worst case scenario - the voltage on the internal bank of the lithium-ion battery is 2.0 Volts (we won't be able to measure it without disassembling the battery, so we'll just assume that this is the case).

Then the difference between the power source voltage and the battery voltage will be:

Let's calculate the resistance of the current-limiting resistor so that the charge current does not exceed 50 mA (this is quite enough for the initial charge and at the same time quite safe):

R = 3V / 0.050A = 60 Ohm

Now we find out how much power will be dissipated by this resistor in the event of an internal short circuit of the battery (then the entire voltage of the power supply will drop across the resistor):

P = (5V) 2 / 60 Ohm = 0.42 W

Thus, to restore an 18650 battery after a deep discharge, we take any 5V power supply, the nearest suitable resistor is 62 Ohms (0.5W) and connect it all to the battery as follows:

The power supply will be suitable for a different voltage; it will be enough to recalculate the resistance and power of the limiting resistor. And you need to remember that in li-ion protection circuits, as a rule, field-effect transistors with a low drain-source voltage are used, so it is undesirable to take a power supply with a high output voltage.

If the charge does not proceed (the resistor does not heat up, and the battery is at full voltage from the power supply), then either the protection circuit has gone into very deep protection, or it has simply failed, or there is an internal break.

Then you can try to remove the outer polymer shell of the battery and connect our improvised charger directly to the can. Plus to plus, minus to minus. If in this case the charge does not go, then the battery is screwed. But if you do, you need to wait until the voltage rises to 3+ Volts and then you can charge as usual (with standard charging).

Now the situation is different - the resistor, on the contrary, heats up noticeably, but there is zero voltage on the battery, which means there is a short circuit somewhere inside. We gut the battery, unsolder the protection module and try to charge the can itself. If it works, then the protection board is faulty and must be replaced. However, you can use the battery without it.