What was found
(CAN) DURING THE ANNUAL INSPECTION OF THE ELT, UPON OPENING THE UNIT, IT APPEARED EVIDENT AN INTERNAL BATTERY CELL HAD RUPTURED, WAS BULGING AND LEAKING ELECTROLYTE. THE BATTERIES ARE OF LITHIUM ION TECHNOLOGY. THE ELT BATTERY WAS REPLACED WITH A NEW PART, THE ELT WAS FUNCTION TESTED SERVICEABLE AND RETURNED TO SERVICE.