Accutome PachPen Battery

1/2 AA size cylindrical cell with button top. Also known as a LS14250, XL-050F, TL5151. 3.6 Volt Lithium Battery. 

Works in: Memory backup: CMOS memory, RTC backup; AMR utility meters: Electricity meter, water meter, gas meter, heat meter; Wireless alarm/sensor: Smoke alarm system, temperature monitor;