I have found several. Fenix and Olight have good 'Keychain' AAA lights. I like them but if I had to pick one, I might go for the UltraTac K18 AAA Keychain LED Flashlight. The LED is a CREE XP-G2-S4 and they have a version that is USB Chargeable. The Stainless Steel is solid and a bit heavy but...