As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BIL - FLT 2585 - RIGHT BATTERY OVERHEAT LIGHT CAME ON ABOUT 20 MINUTES AFTER DEPARTURE WHILE CLIMBING. CREW FOLLOWED EMERGENCY CHECKLIST PROCEDURES. CREW RETURNED TO STATION WITH NO FURTHER PROBLEMS. BATTERY WAS COOL TOUCH, SUSPECT WIRING PROBLEM. REPLACED CORRODED AIRFRAME SIDE CANNON PLUG. SYSTEM OPS CHECKED GOOD. (M)