For those that own a Mophie JuicePack. There are 2 ways to use a Mophie- 1. ON. Mophie battery runs down first, iPhone stays at 100% 2. OFF. iPhone battery runs down first. Turn on Mophie when needed. Do you leave it ON or OFF when starting out the day? I think the first way is better because the iphone battery gets less charge cycles on light usage days. And the mophie only has to maintain 100% which is easier than recharging while depleted.