On 3/4/2010 4:01 PM Robert Macy spake thus:

On Mar 4, 3:42 pm, "hr(bob) "
wrote:

I have a small battery-operated calculator that I rarely use, but when
I do need it, I want to be sure the battery hasn't run down. The
button cell can be a LR54, LR1130, D189, RW89, 389, SR54, or one of
several other codes, Either silver or alkaline. Does anyone know
which type of battery has the lowest internal self-discharge?

Keep in mind, that a lot of battery chemistries have the following
quirk:

shelf life years!, unless...
measure the battery's voltage under load [in other words, use it once]
and a process starts that runs the battery down very quickly with
shelf life into even the 3 month range. [which means it's not good to
test the batteries in those emergency kits]

Anyone have numbers for this effect?

The Heisenberg uncertainty principle? Schrödinger's cat?


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