Im on .63 with windows insider before.. Battery life is quite good that time.. Then i leave the program to get the latest firmware update because i don't want to do hard reset.. After done installing the latest firmware update my battery drowning like **** !!! In one hour of normal using, no games no video streaming just reading the comments in windowsC and some social chat with whatsapp and wechat.. I lost over 20% !!!! I thought that the latest firmware update will make my battery life gets even better but it's not !!!! (sorry for my bad English)