There's good reason for the old saying, "Batteries never die, they're always murdered."
Deeply discharging a battery will drastically shorten its lifespan, and reverse-polarity "charging" it is akin to driving a stake through its heart.
You may be able to force some small amount of zombie life back into that battery, but it won't be much and it won't be for long.
This is the bad news. The good news is that you'll get a lot of use from any new cell you buy that is properly maintained with a quality charger.
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