As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY CONDITION LIGHT CAME ON 3.5 HRS INTO FLT. NO AVIONIC OVERBOARD LIGHTS ON. CYCLED BATTERY CHARGER, C/B DID NOT CORRECT SITUATION. BATTERY CONDITION LIGHT WENT OUT 30 MINS AFTER IT CAME ON. BATTERY PHYSICALLY FELT WARM NOT HOT, 10 TO 15 MIN AFTER FIRST INDICATION. BATTERY CONDITION LIGHT ON A SECOND TIME 1 HR LATER.