Originally Posted by Tourist in MSN

I suspect you do not want to be removing the batteries to charge them. Thus, I suspect you want Li Ion batteries, but you did not specify.

Thus, I do not think you would be interested in what I use for taillights. I use AAA powered Planet Bike Superflash or Superflash 65 lights. And I use NiMH rechargeable AAA batteries. When touring I bring a USB powered NiMH AAA and AA charger. That meets your stated criteria, but I am removing the batteries from the light to charge them once a week.

Headlights, there are AAA powered lights too, thus you can run them on NiMH AAA batteries. But I have not bought one for over a decade, so I am not going to suggest one that probably is no longer made..

For home use I use an Accupower IQ328 AA/AAA charger, but I use a lot of AA and AAA batteries, so I invested in a top notch charger and this one is not USB powered.