I recently found my LiFePO4 battery pack for the Acura flat and assumed it was a lost cause. I threw it on a charger and it accepted what appears to be a full charge. The charger didn't see the battery pack due to low voltage and wouldn't charge, so I used a switching PSU to give an initial charge. After that, my battery charger accepted the battery and gave it a proper charge and balance.
... still, even if the battery was toast, it's a heck of a deal on the platform. Don't know how difficult it would be to build your own pack.
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