I had the EVIC battery carrier until it overnight just not let turn on about 2 months in operation today. After the Joyetech Support had assumed me first, I would have him damaged himself, he could offer me after two weeks still no solution, would satisfy me. After a friendly chat with Amazon, offered to return me to the device. This offer I could not refuse. After very unsatisfactory support of Joyetech I decided never to buy a Joyetech product. For 70, I expect quality and not cheap China-Sch ****. My next battery carrier is the Sigelei Legend V2)