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Yep, I destroyed a $45 LiFePO4 by over-discharging. It happened very quickly. I had my Acura engine off, but the ignition on, and was testing various accessory draws when the car rapidly showed signs of low voltage. By that time it was too late and the battery had puffed up. I removed the puffed up cell and the remaining 3 are probably in decent condition, but I don't have a use for a 10v battery at the moment.
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