As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BATTERY WAS LEFT ON. UPON RETURN TO ACFT 2 HOURS LATER, BATTERY WAS TOO LOW TO START ACFT. PILOT THOUGHT BATTERY/EPU SWITCH WAS TURNED OFF, BUT YOU HAVE TO PUSH THE BUTTON UP TO 4 TIMES BEFORE IT STAYS IN SELECTED POSITION. CONFIRMED PILOT`S SNAG. BATTERY/EPU SWITCH STICKY/STIFF/INTERMITTENT. REPLACEMENT PART ORDERED.