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But if I only need one every other year I'll have to charge the thing before I use it anyway. Besides should you not store rechargeable Li-batteries at 50-80%?
I had NiMH batteries in mind since we're talking about types that come in alkaline, and low-self-discharge NiMH batteries (e.g. white Eneloops) are generally fine to fully charge before storage.
You might end up with a bit shorter runtimes storing charged batteries for years than charging them right before use, but it doesn't matter much when your runtimes are measured in years.
There's one potential snag with certain low-power devices though: a few only work in the 1.3-1.5V range. That's terrible design since it doesn't use most of the power in an alkaline, but some of those won't work at all with NiMH.