As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY IS WEAK. CHARGED BATTERY AND PERFORMED CAPACITY CHECK. FAILED 1ST CHECK (23 MINUTES). PERFORMED CONDITIONING CHARGE, RESTED AND PERFORMED 2ND CHECK. FAILED 2ND CHECK (30 MINUTES). WORK PERFORMED IAW MFG BATTERY MANUALS. REPLACED BATTERY.