As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE INSPECTION, THE NR 2 BATTERY FAILED THE CAPACITY CHECK. FIVE OF 19 CELLS NEED REPLACING. THE BATTERY IS LESS THAN ONE YEAR OLD. THIS HAS BEEN AN ONGOING CONDITION FOR THIS TYPE OF BATTERY. 'A NEW AND IMPROVED BATTERY'. ALSO, 3 CELLS SHOWED EVIDENCE OF EXTREME HEAT (MELTING OBSERVED).