All batteries will drain down over time due to internal discharging and
discharging externally between the electrodes if there is any moisture
or acid on the top.  The older the battery the faster this will happen.
Clocks, radio memories, etc. also drain tiny amounts of current.  Have
the battery capacity and conditioned checked before you spend too much
time trying to track down a drain.
--
Stuart MacMillan
Manager, Case Program
800-909-8244 ext. 8208

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