So, yesterday my Lumia was sitting at 48% charge. I opened a few apps, used them, then put the phone in standby. Several minutes later a pressed the power button on my phone again and it would not come out of standby for whatever reason. So, I did a soft reset (holding power and volume down buttons). After the phone rebooted, I checked the battery life, and it now read 73%. I'm starting to think this whole battery life issue could just be an issue with the OS and the algorithm used to determine remaining battery life. Has anyone else experienced similar behavior?