Been using my 820 for about 10 months. I always get about 2 days of battery life out of mine and I have gotten as much as three. I use my phone when I need too and do not pamper it. I found Amber and then Black helped not only the camera; but also battery life. It has the same insides as the 9XX series; plus it has a SD card slot and a removeable battery. When 8.1 comes out and you can load apps to the SD card its going to be one of the better buys out there as none of the 9XX have a SD slot. I installed a 64GB Sd card in mine and use it for pictures; videos,movies, and maps, leaving the internal memory for only apps. I am running about 40 apps and still have over 4.5GB of memory free. And like the guy said, the screen is beautiful for a 4.3 incher. Plan on keeping mine for quite awhile as nothing they have out now comes close to what you get with a 820 for the money spent. The only phone that might be a better buy is the 520 and I have one of those as my backup.