What was found
CABIN EMERG LIGHT: DURING FLIGHT WITH THE EMER LT SWITCH SET TO ARM, CABIN EMERGENCY LIGHTS WERE ILLUMINATED AND FLASHING INTERMITTENTLY DURING INITIAL CLIMB UNTIL AIRCRAFT WAS SHUTDOWN. REMOVED FAULTY #1 EMERGENCY BATTERY PN: 6450LS-00 SN: 002608 AND INSTALLED NEW EMERGENCY BATTERY PN: 7450LS-00 SN: 006774 IAW PHENOM 300 MM 33-52-01. PERFORMED THE OPERATIONAL TEST OF THE EMERGENCY BATTERY IAW PHENOM MM 33-52-01, WITH NO DEFECTS NOTED. BOTH THE #1 AND #2 EMERGENCY BATTERIES ARE PN: 7450LS-00. CLOSED ALL ACCESS AS REQUIRED.