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Buy a dive light or wall clock etc. that uses the same battery and alternate.When I go on a trip, I take a spare battery for my computer, and a few other things like my camera housing. I have yet to actually need to use it, and most of the time there are several batteries in a pack.
On the next trip, I may have 2 or 3 batteries I didn't use on my last trip. But batteries won't last forever even unused, another pack is $5 and a dead battery completely ruins my trip. So my next trip, I may have 6 batteries but need to buy more.
It isn't just the waste of $5 every trip, I don't like throwing unused batteries in a landfill.
What else does everyone do?