Actually, the battery temperature makes sense to me. I'm thinking that the battery is being heated by the electronics components heating up. Notice that the battery temperature rises when the voltage and battery percentage are dropping relatively rapidly. The electronics are heating up because the device is being used and this heat conducts to the battery. In addition, the battery is heating because it is being used. The battery heats up anytime it is charging or discharging more than it does when idle. It's the same with percentage and voltage. They drop anytime the device is being used and discharging. Screen off and little CPU usage = lower temp and lower voltage and percentage change. Screen on and more CPU usage = higher temp and greater voltage and percentage change. Edit: As far as the battery life on the Maxx, it is great. The original problem if the percentage rapidly falling from 50% down to near 0% was after a long usage time. This has not happened after charging back up to 100%. The 2nd rundown was smooth until a fairly quick drop from 14% to 8%. I expect that this will smooth out more now that it's had a 3rd charge.