As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY PACK COVER MELTED AROUND TERMINAL POSTS. THIS CONDITION CAUSED BY LOOSE/HIGH RESISTANCE CONNECTION BETWEEN TERMINAL POSTS AND CELL TABS. SUBMITTER RECOMMENDS MANUFACTURER USE THICKER MATERIAL FOR COVER PERHAPS OF A PHENOLIC AS THEY USED TO DO IN PREVIOUS YEARS. EARLIER PACKS ALSO INCORPORATED A SCREW AND JAM NUT CONFIGURATION TO MAINTAIN A SECURE CONNECTION.