As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REMOVED BATTERY FOR REPLACEMENT DURING SCHEDULED MAINTENANCE AND FOUND BATTERY PACK HAD SPLIT AND EMITTING ACID. SPLIT WAS ALONG NARROW SIDE, RUNNING APPROXIMATELY 1.50 INCH. SUSPECT CAUSE APPEARED TO BE POOR EPOXY SURROUNDING BATTERY PACK.