Wayne Parham Messages: 18784 Registered: January 2001
Illuminati (33rd Degree)
Trace the circuit board and see what the battery powers. Chances are, it's a memory chip or module with memory and RTC. Might go through a diode, which will cause a 0.7v drop. Find out what component is powered by the battery and you can find out what voltage it requires. That will let you know what battery you'll need.