While it may seem tempting to try jump-starting a dead lithium-ion battery or using unconventional methods to revive it, the truth is that once a battery reaches complete depletion, it cannot be recharged. The chemicals inside the battery have undergone irreversible changes that prevent them from holding a charge.
In order to charge a dead car battery, a set of jumper cables and a functional car with a charged battery are required. However, you may need a float charger to run a trickle recharge if the battery is especially old or hasn’t been used in a while. We spoke with professional automotive mechanic Duston Maynes to help break all of this down for you.
Whether you accidentally left a light on overnight or you’re trying to resurrect the fixer upper in your garage, you may need to bring a car battery back to life. In order to charge a dead car battery, a set of jumper cables and a functional car with a charged battery are required.
Wait 1-2 minutes for the battery to fully recharge. This will give the dead battery time to build up a charge of its own, although it may take longer to fully charge the battery if you haven’t used it in a while. Try to start the engine of the car that contains the dead battery.
When a lithium-ion battery dies completely, it often goes into a state known as “deep discharge,” which can cause irreversible damage to its internal chemistry. Attempting to jump-start or force charge a dead lithium-ion battery can result in overheating and even explosion due to the accumulation of gas inside the battery cells.
If the battery has been dead for some time, it may take longer to charge it enough to start. Disconnect the cables and allow the vehicle to run. Once the vehicle starts, you can disconnect the jumper cables from each vehicle. Allow the vehicle that had a dead battery to continue to run for a bit.
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