Phone charges too quickly and dies just as fast
Over the past month and a half, my phone's charges jumps whenever its on the charger . It'll be at 28% and as soon as I put it on the charger it goes to 40% and if I take it off it'll slowly decline over the next few minutes to an even lower percentage. Even if I charge it to 100%, turn off, or reset, this will keep happening. I bought a new charger from Sprint ($15 so it better had worked) but that didn't help in anyway.
iPhone 6, iOS 9.3.1