... precision machining and work fine, mini size, carried more easily 2, lamp: The United States CREE R5, excellent brightness, maximum brightness can ... diameter 16.5mm, overcharge protection, overcharge 4.2V, voltage : 2.75V, battery cycle life of more than 500 ; Size:Diameter ... length 36MM(General protection battery than the average of 1 - 2 mm long, electricity in contrast with no protection even higher ...