Blackburn Flea 2.0 USB Rear Light

I really like this light. It is very bright and has multiple settings such as steady and two modes of flashing. Easy operation with a decent-sized diamond-shaped button. It's somewhat difficult to operate on the seat post with gloves on, but if you remember to turn it on before climbing on you are good to go. The charge lasts at least as long as advertised, easily all day. The charging is easy from a USB port and it's pretty quick. Very nice light.

Simply the best rear light for a helmet. It integrates perfectly with Bell Muni helmet and battery lasts a lot I've been using it every night for half hour for about three weeks and hasn't need to recharge it.

Intensity of light is really bright, to the point that it might blind you for a second if you stare to it. Really worth the price because of its quality, it is really light, small and bright.

Purchased light on discount at BTD, that was a good deal! For the first 3-4 uses it had a chargingbattery issue. I would take it on a ride, fully charged, then the next time I wanted to ride it would be completely dead. Started to make sure it was fully charged at the beginning of each ride, did this for several more rides. Finally, it seemed like the battery started taking a complete charge and now it is working fine, with it now lasting for multiple rides. Not familiar with Lithium-Ion batteries--maybe a characteristic?