How to revive a dead laptop battery
New life of a dead battery
Lithium-ion batteries power tons of consumer electronics and have even made their way into hybrid and electric vehicles. But unlike normal AA and AAA alkaline batteries, lithium-ion batteries for your electronics can be pretty expensive to replace.
Lithium-ion (Li-ion) batteries are rechargeable, but even rechargeable batteries have a limited number of cycles before they start to degrade. Over time, they take longer to power up and lose their charge much more quickly.
So, if the lithium-ion battery in your laptop has seen better days, there are a few things you can try to bring it back to life before spending the cash to replace it.
If your battery can't hold its charge anymore and drains extremely fast, you might be able to save it by doing a full recharge. You'll need to completely drain the battery for this to work, so once it reaches zero percent, keep turning it back on until it doesn't even have enough power to boot. Now, plug in the power cord (to a power outlet) and let the battery charge for at least 48 hours.
If the battery you're trying to fix goes with a device you use on a daily basis, you'll want to do this over a weekend or find a backup you can use for a couple of days.
The same freezer that holds your frozen pizzas and TV dinners can often bring seemingly-dead laptop batteries back to usable (though not quite like-new) condition.
1. Put the dead laptop battery in a sealed plastic bag.
2. Put the bagged battery in the freezer for about 12 hours.
3. Take the bag out of the freezer, and let the battery warm up to room temperature, drying it occasionally with a towel if it appears damp.
4. Put the battery back into your laptop.
After regeneration of the battery in the freezer it is recommended that the "Full Recharge" procedure from the previous paragraph is done.