As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY CHARGE ANNUN CAME ON IN FLT (ILLUM FOR 2-3 MIN THEN EXTINGUISHED) CAME ON AGAIN AND EXTINGUISHED AGAIN A FEW MINUTES LATER, ABNORMAL CKLIST ACCOMP BOTH TIMES (PROP AND W/S DEICE ON). THIS BATTERY CHARGE LIGHT ILLUM IS CONSIDERED A NUISANCE WARNING, CAUSING SERIOUS DISTRACTION TO THE PILOTS. REMOVED AND REPLACED BATTERY.