My FT02 prototype has close to 700m throw (120Kcd+). You can expect higher readings for retail version, as FT02 undergo driver upgrade and better polishing for its reflector.
Maukka and manufacturer do not have problem using their Samsung flat top. However, my stock LiShen unprotected 21700 will not work with this light because of the size of anode connector is too big for the opening.
It consumes about 5mA of the battery with breathing light ON. You can further reduce the drain by disabling the breathing function for final retail version. (Note: unable to disable on prototype due to incomplete firmware).