Dry batteries [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

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The shelf life of "dry-charged" batteries is not indefinite. There is a 
slow breakdown that varies with temperature and humidity. I was once 
given some 20-year old military surplus batteries that had spent at 
least a good part of that time stored here in New Mexico. I filled them 
and applied the typical "activation charge". Some cells failed fairly 
quickly, then remaining batteries were of some use in a backup system 
for a couple years, but they weren't all they could be.

I was told that the dry climate of storage would have helped them store 
much longer than the typical warranty limit of 1 year. Apparently it 
did, but not indefinitely.

Windy

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