Why does my iPhone not show battery health?

Why does my iPhone not show battery health? I puruchase my iphone 7 (second hand) yesterday who works on ios 12.3.1 and i cant see battery helth in settings. I actually could somehow to see with help of itools that my capacity is currently in 89% but cant see on my device.
Asked by: Guest \| Views: 153

Total answers/comments: 4

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Guest [Entry]

"Some aftermarket batteries do not support the battery health feature in iOS and that battery is one of those. To have one that does another battery would have to be put in either one that is original or a higher quality replacement battery.

If the battery is holding it’s charge fine I wouldn’t worry about it."

Guest [Entry]

The battery was probably replaced. If you want to see your battery health download coconut battery on max and plug your phone in. It will give you all of the info on the battery like cycles and that type of stuff.

Guest [Entry]

I don’t understand this max

Guest [Entry]

I have the same problem with my 6 plus. It keeps restarting after a few seconds and it does not show the Battery health. I have replaced its original battery with a brand new after market one about 1 year ago. The only way I can have my phone on for a long time is to connect it to a charger and put it in airplane mode with no wifi and not to get its screen unlocked. I am wondering if replacing the battery can solve the problem.