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This is not that unusual. You're lucky that it's that high. Many people with launch-day iPhone X are seeing upper 70/low 80% battery health.
 
My iPhone 6S has a brand new battery from an authorized service center. Within three months it’s dropped to 93%. I almost never let it get below 30% any given day so I’m all kinds of suspicious how it degraded so fast, given that my last battery was at 83% after two years.
 
I doubt you even observe battery life of 10 iOS devices a year. Lol.

The drop to 99% takes the longest amount of time. You need to study your basics.
I know this is an old thread but you have no idea what you are even talking about. This thread is about battery health, not battery life. The battery is rated for 80% remaining health after 500 cycles. 98% with 150-200 cycles is NOT normal. You should expect to lose 1% health every 25 cycles. Thus 50 cycles for 98% is normal.
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My iPhone 6S has a brand new battery from an authorized service center. Within three months it’s dropped to 93%. I almost never let it get below 30% any given day so I’m all kinds of suspicious how it degraded so fast, given that my last battery was at 83% after two years.
As mentioned in this thread, battery health is not linear. You could be at 100% for a year, or you could be at 91% for a year. All you need to do is look at health vs. cycle count. If you hit 80% health before 500 cycles, then your battery is faulty.
 
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As mentioned in this thread, battery health is not linear. You could be at 100% for a year, or you could be at 91% for a year. All you need to do is look at health vs. cycle count. If you hit 80% health before 500 cycles, then your battery is faulty.

Yeah I’ve already got an appointment with the Genius Bar to warranty my battery. It’s a 90-day-old battery and I never fully discharge it ever, so it’s got 60 cycles on it tops. Yet the health says it’s only 93%. To be at 93% I’d have to have fully discharged and recharged twice a day since the replacement.

To add icing on the cake, it charges from zero to 90% in less than an hour and then discharges in big erratic jumps when I’m not using it and seems to not discharge at all when I am. And it’s started doing a rainbow ripple under the screen so I’m 99.9% sure this “new” authorized battery is crap.
 
I got a replacement battery end of December down to 98%.
Got one in the middle of December and one at the end, both for iPhone 7 devices that were purchased at the same time 2 years prior to that. First one is down to 95% while the second one is at 99%.
 
Just found this thread but I got a brand new battery on my 8 Plus mid-January. It is now March 25th and I'm at 98.9% with 64 total cycles.

Just some info to help anyone out. :)
 
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