What was found
DURING EXTERIOR PREFLIGHT LIGHT CHECK PUT THE EMERGENCY LIGHTS IN THE ON POSITION AND OBSERVED THE EMERGENCY LIGHTS FLASHING. SHUT POWER OFF TO AIRCRAFT AND TURNED EVERYTHING BACK ON AND OBSERVED THE EMERGENCY LIGHTS ON WITH THE SWITCH IN THE ARM POSITION. PERFORMED FIM 33-50-00-810-802-A, FOUND NR 2 EMERGENCY BATTERY FAILED TO CHARGE. REMOVED AND REPLACED NR 2 EMERGENCY BATTERIES IAW AMM 33-52-01, OPS CHECK GOOD IAW AMM 33-52-00. REMOVED NR 2 BATTERY REPAIRED BATTERY INSP.