I've had my phone for about a year. I received an extended battery with the purchase and have gone back and forth between the stock and extended battery. I have noticed my extended battery has been draining incredibly fast lately so I decided to test something out. With all radios off and the phone at 100% just sitting idle it still lost nearly 12% over 5 hours. Is this typical or is there something that could be causing this? The top 3 entries in the battery stat are Phone Idle 39%, Cell Standby 28% and Android OS 23% I am running AOKP 4.1.1 I have seen other threads where people mention the hyperion 3800 mah battery so I am looking in to this as an option, but just want to rule out something about my OS as being the cause. Am I wrong to assume that this much battery drain in an idle phone is too much?