What was found
(CAN) DURING ROUTINE VISIT IN AVIONIC SHOP FOR REGULAR BATTERY CHECK, THE CASE OF EPSU BATTERY WAS FOUND WITH A SMALL BURN. THE ASSY WAS OPENED AND CELLS NR 4 AND 5 WERE FOUND SHORT CIRCUITED AT THE TOP WHERE THE CONNECTING TAB IS POSITIONED. FOLLOWING TWO REASONS ARE VERY PROBABLE: 1. EITHER MISPLACEMENT OF THE BATTERY INNER RUBBER SPACING INSULATOR 2. OR ONE OF THE TWO BATTERY CELLS OVERHEATED. THIS MIGHT HAVE CAUSED THE THERMOPLASTIC OF THE CELLS NR 4 AND 5 TO CRACK, CAUSING A SHORTCIRCUIT BETWEEN THE TWO CELLS. BATTERY HAS BEEN SCRAPED.