I have seen many threads from folks saying that their phones just up and decided that they will not fully charge the battery. What have I done? Reboot the phone several times, when changing to a different ( and new ) battery, plus going back to the OEM battery. So, 4 batteries tried out, 2 of them new, two of them used, one came with my first Note 4, the 2nd came with my current Note 4 which is rooted ( for what that might be worth ) The phone shows 84% and does not go any higher. The Red LED stays lit indicating that the phone is in Charge Mode. Typically it would go Green at 99-100 percent. I can't see how it would make any difference, or why it would cause it, but I installed Facebook on the phone and suddenly the "life cycle" between charges went to hell..... discharging at 3 times the normal rate.... then I changed the batteries, and no help, then I uninstalled Facebook, and still no help. The only thing unusual that I can remember is that I have dropped the phone twice in the last couple of weeks. But it is installed in wrap around folding leather case with a magnetic latch to keep it closed. It once hit flat as a pancake on its' backside and I thought "aw shit!!!" because a different attitude would give the case a chance to soften the blow. I can't think of anything to "fix this", can you??