How is that a lot for two years. The OP has 700 cycles. That's one a day for 2 years. The iPhone is designed to maintain 80% battery capacity after 500 charges. OP is at 70% with 705 cycles. Looks to be perfectly normal. Just a worn battery. Nothing about being a heavy user. I've had my 6s for 5 months now and I'm at 140 cycles, and I'm definitely not a heavy user.855 mAh worn off, 2 years old? new battery needed. thats a lot for just 2 years, ur a heavy user i guess.