Mine's cheap and uses regular batteries.
I mount it in the rear triangle between the seat stays on the Surly, see pic ^^^^^ but it doesn't work on all frames that way, on my other bike it just kind of sticks out like a weird dongly thing from the seatpost so I only use it on the Surly.
Still awesome, and cheap for a light bright enough for day use.
Mine's cheap and uses regular batteries.
I mount it in the rear triangle between the seat stays on the Surly, see pic ^^^^^ but it doesn't work on all frames that way, on my other bike it just kind of sticks out like a weird dongly thing from the seatpost so I only use it on the Surly.
Still awesome, and cheap for a light bright enough for day use.