I purchase this light a week ago from Home Depot for almost $ 25 and it no longer work . do everything Maglite recommend and still no luck . Problem be either the tail cap or the barrel\/switch . light flash intermittently when tighten the tail cap after battery replacement , but once the tail cap be tight , the light no longer work . what a disappointing product from Maglite . I just go to Sports Authority and find a Nite Ize lead upgrade for my old Mini Maglight and that have be work flawlessly . it do not have the same intensity or the beam focus as the mag lead , but at least it work . P.S. I forget to mention the extremely poor battery life . lead light be by theory suppose to last longer than krypton bulb . not so with this light . I be lucky to get 4 hour out of mine . this may have be cause by the problem mention above , but my Nite Ize upgrade have last almost 8 hour now , and no sign of wear down .