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iPhone 7Plus, 18 months old, still showing 100%

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iPhone X purchased 2 weeks after launch - 100%

8 plus purchased early December - 100%

I’m a light user(8 plus) and my wife is a power user.
 
iPhone 6+ purchased April 2015 - battery is at 95%

iPhone SE purchased September 2017 - battery is 100%

I never fully drain either one.
 
About a month ago, my wife's 6:
- purchased January 2015
- Coconut Battery showed 83% and mid-700s for cycles
- the battery was recently replaced so no interesting data now

My iPhone 7
- purchased September 2016
- 99.9% capacity
- 112 cycles per Coconut Battery
 
About a month ago, my wife's 6:
- purchased January 2015
- Coconut Battery showed 83% and mid-700s for cycles
- the battery was recently replaced so no interesting data now

My iPhone 7
- purchased September 2016
- 99.9% capacity
- 112 cycles per Coconut Battery

How i can download this app coconut battary
 
iPhone SE, activated on 17 September, 2016

iOS Battery Maximum Capacity: 97%

iBackupBot:
CycleCount: 236
DesignCapacity: 1600
FullChargeCapacity: 1600
Capacity: 100%
 
iPhone 6s Plus
September 2015
81%
But I just got battery replacement at apple store yesterday and now showing 100%.
 
iPhone 7 from beginning of october 2016 at 90% according to Apple.

Coconut battery says 501 cycles and 88% capacity.

In June of 2017 put a smart battery case on my 7 because sometimes i play a lot of Pokémon go which kills the battery/batteries. I figured this would help reduce cycles on the main battery and it did.

I’d say my built in battery is doing pretty good. Wish there was a way I could check the health of the smart battery case too!!
 
iPhone 6S, in service November 2015. Showed 85% to 89% max capacity the few times I checked.
However, with "performance management" off yesterday is crashed and restarted while updating apps.
Battery charge was at 46% when app updates started, then dove down to 10% and crashed.
After crash restart "performance management" was enabled by iPhone.
And then it fully charged much faster than typical.
New battery here I come.
 
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