if you bought the cree that comes with the ultrafire(blue batteries),the charger they sent with mine was no good,it plugged into the lamp,charged al day and didnt work,buy the charger that you put the batteries into,fits 2 batteries,mine spot on,there about £6,never had any bother with eitherof my crees,i bought 2,dont buy the ones what take AAA batteries,im guessing they wont last 2mins with that output