A mechanic describes inspecting an ACK ELT (emergency locator transmitter) as required by 14 CFR part 91,
section 91.207(d) during an annual aircraft inspection. “The 24 month old Duracell MN1300 batteries were found leaking, with fluid visible in the bottom of the unit. These batteries were all dated March 2009. (I) recommend replacing batteries in these type of units each 12 months or requiring a sealed battery installation.”

Part Total Time: 24 months.