Hi there. I recently upgraded from a lumia 1320 to the new lumia 950 however this phone requires a charge twice over a 12 hour period(i use my phone moderately throughout the day). The 1320(3400mAh) gave me 2-3 days baterry life with a single charge, i have expected the 950(3000mAh) to give me atleast a day and a half due to the new software and the 1440p screen but thats not the case i lost 40% battery in 5 hours while on standby. Please note that the phone is only 4 days old and i have read other forums that suggested i do a reset of the device which i have done to no avail. On a full charge battery saver says it will last 16 hours after the reset it stated one day and 17 hours, short while later(78%) it stated that it will last only 17 hours. I really love the 950 and its awesome features but this battery is kiling me. Especially when theres a sony xperia m5 that lasts 2 days on a single charge. Nokia/ Microsoft phones were built on great Camera's, awesome sound quality and thee never ending battery life. i would be please if i can get through an entire day of use and still have 40% left over at the end of the day.