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Sounds like that battery went into the negative when discharging (I'm going on theory here, but it makes some sense)...Which could explain that flipped polarity.
You probably could salvage that battery, but you'd have to seperate that flipped battery and then run it through several FULL charge/discharge cycles (WHILE monitoring the voltage to MAKE SURE you're working in the positive again) to MAYBE get it working right again.
You COULD salvage, but is it worth the $3-$5 you paid for that battery?
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