As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON TAXI DEPARTING MMU FBO WE NOTICED THAT THE EMERGENCY LIGHTS WERE STILL ON AS THE EMER LT SWITCH WAS PLACED IN ARM. WHEN REACHING THE RUN-UP PAD AT MMU THE EMERGENCY LIGHTS BEGAN STROBING CORRECTIVE ACTION: REMOVED AND REPLACED NO.1 & 2 EMERGENCY BATTERIES. PERFORMED A SATISFACTORY OPERATIONAL TEST AND A SATISFACTORY FUNCTIONAL TEST OF THE EMERGENCY BATTERIES IN REFERENCE WITH EMB 505 MM: 33-52-01 WITH NO DEFECTS NOTED.