If you have left your battery on the official charger for 24 hours and it still shows no signs of life, the cells are likely chemically dead. Attempting to revive them with "Battery Killer" software is essentially trying to pump life into a hazardous object.
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If you find a simple .exe file claiming to do this, it is almost certainly malware. If you have left your battery on the
: Click Reset Chip . After this, the battery should respond to a standard DJI charger. Safety Warnings Battery Routine Maintenance Guide - Support - DJI dji battery killer software download