Fry's Electronics now has AA and AAA batteries that have a built-in charger inside the battery.
It uses a microUSB cord that you plug into whatever kind of power-bank you have available, be it a battery-pack or charger, or lantern, or wind-up gizmo. These new batteries only have capactiy of 80 mAh at 5 volts for AAA and 110 mAh for AA size. 2-packs are $ 10 plus tax, and are under the brand name "Joule Cell." I can not see any reason to own these, but haven't put any thought into it yet. But they might be a good white-elephant gift at a caver party. On a related topic, Fry's also has a keychain light by SureFire, that cost a whopping $ 70 plus tax. You read that right - approximately seventy-one US buckaroos. Astronomers now believe the best place to look for "limestone" caves in our known Universe is a group of 3 exoplanets about the star they call "Trappist-1." These exoplanets are labeled "e," "f," and "g," The theory is that enough water and organic life exist to form karst. ( okay, I just made that all up, but it sounds good to me ) David Locklear still retired NSS # 27639
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