I've noticed as of late that my 6+ doesn't charge to 100%, even after a couple hours attached to a wall or computer charger. Once in a while, I'll see 100% but as soon as I unplug the phone it drops to 99% or 98%. Anything to be concerned about? I've not found anything about this on Apple support forums or with any Google searches. My 6+ is jail broken on 8.1.2.