I have been using the Alien since march with efest 3100 mAh batteries, however a few days ago it suddenly stopped working. i found a second hand one on ebay for cheap so have been using that ever since. Today I thought lets have a little play with the dead one and see if i can get it to work again. I put some old 2500 mAh samsung batteries in and it started up straight away but still wont work with the efest batteries. My question is what the hell is going on there?