Can A Completely Dead Battery Be Recharged?

If you’re wondering whether a completely dead battery can be recharged then you’ve found the right article. In this article, not only will you find out which batteries are best for this, you’ll also find out how long they can be recharged for, and how to do so as well!

So keep reading to find out everything you need to know!

Can A Completely Dead Battery Be Recharged?

Yes, it is possible to recharge a completely dead battery. However, the process of recharging a completely dead battery can be difficult and time-consuming.

On top of this, once the battery has died completely, even if you recondition it, it will only be at around 70% of the power that it was before

How Long Can A Car Battery Be Dead And Still Be Recharged?

While there’s no set limit for how long a car limit will stay dead before it can’t be recharged anymore, generally it will take anywhere from a few months to stop working completely, to five years.

The longer you leave the battery dead without charging it, then the less likely it will be to recharge when you do try.

How To Charge A Completely Dead Car Battery?

If you’re going to charge a completely dead battery, the two main ways to do so are by either jump-starting it, or by trickle-charging it.

Fortunately, here’s a brief guide on how you can do both!

How To Jump-Start Your Car Battery

  1. First, make sure that both your car and the donor’s car are off. Then, connect the red, positive jumper cable to the dead battery’s positive terminal. Next, attach the other end of the same red cable to the donor vehicle’s positive battery terminal.
  2. After this, take the black negative cable and connect it to the donor vehicle’s negative terminal, and then attach the other end of the black negative cable to an unpainted metal surface on your car. Finally, start the donor vehicle and let it run for a few minutes, then try starting your car.
  3. Once the car can start, you should let it run for 15-20 minutes to make sure it’s getting charged up enough. In an ideal scenario, you should also make sure that you’re driving it during this time, to increase the amount it will charge.

How Do You Trickle Charge A Car Battery

If you have a trickle charger handy, then you can just sit back and let that charge your car for you. Here are the steps you’ll need to follow to trickle charge your car battery.

  1. First, attach the positive and negative clamps from your charger to the battery terminals. If it’s not already on, then turn the charger on.
  2. Next, set the charging rate for a slow trickle charge. A recommended setting is around 1-2 amps or 10-15 volts per hour.
  3. Finally, let the charger run until the battery is fully charged. You should check on it every few hours and make sure that it’s still charging properly.
  4. Once you’re done, disconnect the clamps from your battery terminals. Your car is now ready to go! That’s pretty much all there is to recharging your car battery.

What Are The Signs Your Battery Is Completely Dead?

If you’re not sure whether your battery is completely dead or not here are some of the signs you can look for to find out!

Nothing Happens When You Turn The Ignition On

If your car doesn’t make any sound when you turn the ignition on, then it’s likely that your battery is completely dead.

The Engine Dies Immediately After Starting

When your engine dies shortly after you start it, then the chances are that the battery is dead or it needs recharging again.

No Headlights Or The Headlights Are Dim

If your headlights don’t turn on or are very dim when you start the car, then that’s another sign that the battery has died completely, and it may be time to replace or recharge.

The Battery Is Warped Out Of Shape

If the battery itself looks warped or misshapen, then it means that it has been damaged beyond repair, and it’s definitely dead. When this is the case, once again you’ll need to get a new battery.

It Smells Like Rotten Eggs

Another bad sign, and sign that your battery is dead is if you notice that it smells like rotten eggs. When your battery smells like rotten eggs, then it means that it’s been overcharged for too long, and now it’s leaking sulfuric acid.

The Radio Doesn’t Work

Another sign that your battery has died is if you notice that not even the radio will turn on anymore. Sometimes, when your battery doesn’t have enough charge to turn on the car, it can still power the radio.

But when the radio won’t turn on either, then you can say with some confidence that the battery has died.

The Battery Is Old

If your battery is old and it’s been a few years since you last changed it, then there’s a good chance that it has died as well. As a general rule of thumb, batteries will only last between 3-5 years depending on the make, so if it’s within this lifespan, then it may be time for a replacement.

The Check Engine Light Is Flashing

Lastly, if the check engine light is flashing on your dashboard, then it could well be another sign that your battery has died. This usually happens when the voltage of the battery falls below 12.4 volts and can no longer power the car’s electrical system.


Here are some frequently asked questions that people have about whether they can recharge a dead battery or not.

Can A Completely Dead Motorcycle Battery Be Recharged?

Yes, a completely dead motorcycle battery can be recharged, but it’s not always an easy process. And if you continuously recharge a dead battery then the chances are you’re going to decrease its lifespan over time.

Can A Completely Dead Lithium Battery Be Recharged?

If you have a lithium battery that has been discharged too much, then there’s a good chance that it won’t be able to be recharged again.

Generally, when a lithium battery falls below 2.5 volts, there’s a very small chance it will be usable. And even if you can charge it, it won’t stay charged for long.

Can A Completely Dead Phone Battery Be Recharged?

Yes, a completely dead phone battery can be recharged. However, if your phone is no longer powered on, then it’s likely that the battery has been damaged beyond repair and will need to be replaced.

Can A Completely Dead AGM Battery Be Recharged?

If your AGM battery has died completely, then there is never any guarantee it can be revived again, even with a recharge. That said, if you think that your AGM battery still has some life left in it, then it can be recharged and should last for many more years to come.

Can A Completely Dead Deep Cycle Battery Be Recharged?

Yes, a completely dead deep cycle battery can be recharged. In fact, deep cycle batteries are better than most for being taken down to an incredibly low state and then being charged back up again!


In summary, when your car battery dies, there are a few telltale signs that you can look for. These include dim headlights, a warped Battery shape, the smell of rotten eggs, the radio not working, and an old Battery.

Additionally, if the check engine light is flashing on your dashboard then this could be another sign that your battery has died. Finally, if the battery is completely dead then it can still be recharged, but there is no guarantee that this will bring it back to life again.

In any case, always make sure you check with your local mechanic before attempting any repairs or recharging of a battery yourself. It’s better to be safe than sorry!

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