Olight iMini 2

At 2.17" long and just 0.69 oz, the iMini 2 is the "why not?" keychain light — small enough and cheap enough that there's no excuse not to carry one. The built-in 10180 rechargeable battery charges via the integrated USB plug on the magnetic cap — no cables to lose. 50 lumens won't light up a parking lot, but it's more than enough to find a keyhole, read a menu in a dark restaurant, or dig through a bag. The magnetic base lets you stick it to a car hood or toolbox for hands-free use, and the aluminum body handles 1.5m drops.