I think that you might like one of the Rovyvon "keychain" lights. They are AAA-sized but not AAA-powered. There is a USB micro port on the side.
Depending on your tastes and budget, the Rovyvon Aurora A1x, A2x, A3, A3 Pro, A5x, or A8x might appeal. They're all the same platform and size with slightly different modes or side lights.
If you don't know which to pick, toss a coin and choose between the A3 or A5x. If you're just dipping your toe in, choose the A1x, which is cheapest.
Cutting edge stuff. They are much brighter and more versatile than any other flashlight in this size class. I have them stashed everywhere.