As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BUF- FLT 307 - EN ROUTE LGA-ORD, DURING CLIMB BATTERY CHARGER LIGHT ILLUMINATED. DIVERTED BUF AND LANDED WITHOUT FURTHER INCIDENT. REPLACED BATTERY CHARGER. REPLACED LEFT AND RIGHT SIDE BATTERIES. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)