Hardware: iPhone 5 Is there any app or way to keep the battery at 80% like some laptops have to help the battery longevity? My iPhone 5 spends 99% of its time plugged in playing music every day. Having done quite a bit of Lithium Ion / Polymer reading, keeping the battery at 100% all the time isn't great for the phone. But, I don't want to burn the battery cycles down every day if I don't have to - need this phone to last 2 years and 400 cycles = limiting. Obviously using the cells are better than not ever (and will go to 40% once a week to keep them active). If not I was thinking about manually plugging it into the wall when it hits 30-40% then unplugging when it hits 80% but that seems like a lot of work and the cycles used will cross out the benefit for battery longevity. Anyone know of a way to do this? Any thoughts welcome.