What was found
CABIN EMERG LIGHT: WHEN EMER LT SWITCH IS MOVED FROM THE OFF TO THE ARM POSITION, FOR ENGINE START, LIGHTS REMAIN ILLUMINATED FOR ABOUT 5 MINUTES BEFORE EXTINGUISHING.//CORRECTIVE ACTION//REMOVED THE FAILED FWD EMERGENCY BATTERY AND INSTALLED A NEW EMERGENCY BATTERY REF PHENOM 300 AMM 33-52-01. REMOVED THE FAILED AFT EMERGENCYBATTERY AND INSTALLED A NEW EMERGENCY BATTERY REF PHENOM 300 AMM 33-52-01. EMER LIGHTS OPS CHECK GOOD REF PHENOM 300 AMM 33-52-00.