Well after one week of using knight v2 last night i notice when switched on that is heating like crazy. In 2sec it melted top of battery cover and spring in + pin. Lucky it didnt happen on the move in my pocket it would sure burst in 10sec. Going to write gearbest so be carefull owners. The battery was lg hg2 almost new no chiped wrap or anything else. After i tried other battery just for sec same thing. Its like its shorting somwhere on the board or something. I did notice it goes thru battery pretty fast in begining so theres that to watch out to. Luckly dna40 is coming soon.