Recover a dead lipo battery that won't charge - rescue lipo battery with dead cell safely

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Lipo cell checker - https://alnk.to/apV8npC
This video from RC Review explains how to recover a dead lithium polymer battery that won't charge.

Here's a summary:

Part 1: Quick Recovery

The video starts by showing a dead LiPo battery (the charger displays an error). (0:49)
The solution is to "wake up" the battery by charging it as a Nickel Metal Hydride battery. This is done by unplugging the balance port (1:17) and selecting the NiMH charging type (1:24).
Charge at 1C (the same rate as the battery's capacity). (1:34)
Charge until the voltage reaches 3 volts per cell (this usually takes 30-60 seconds). (1:52)
Then, switch back to LiPo charging mode and resume the charge normally. (2:19)
Part 2: Safer Recovery

A safer method involves using a cell checker or a second charger to monitor the individual cell voltages while charging as NiMH. (4:00)
This allows you to see if one cell is dead (if it doesn't reach 4.2 volts). (4:59)
If a cell is dead, the battery cannot be saved. (5:41)
Part 3: Causes of Dead Batteries

Common causes for dead LiPo batteries include:
Leaving the battery plugged in with the car battery on (6:09).
Not storing the battery properly at 3.7 volts per cell (6:29).
Low-quality batteries. (6:43)
Part 4: When to Give Up

Signs that a LiPo battery is beyond repair include:
A puffy sheath (6:53).
Corroded plugs (7:03).
One cell refusing to wake up or fluctuating (7:17).
Always dispose of dead LiPo batteries properly by fully discharging them and taking them to a recycling center. (7:31)
Essentially, the video provides a two-step process for reviving dead LiPo batteries, along with safety precautions and information about why batteries might die in the first place.