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iPhone 7 severe battery drain

Hello, I have a 2 year old iPhone 7 which suffers from severe battery drain, the battery drains from 100% to 0% within 4-7 hours while not in use. The battery health is at 83%, so that shouldn’t be an issue. I’ve tried resetting it multiple times, updating to the latest iOS, turning on airplane mode. Nothing helped. Settings shows no apps using the battery. I found that the iPhone draws 140mA from the battery. I also have a 5 year old iPhone 7 with battery health at 77% and it drains from 100% to 0% in like a week. What could cause it?

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any issues with wifi ?

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Wifi works just fine. I've tried with airplane mode on, no change.

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If you got those readings from a DCPS you would defiantly have a board problem. If you are using an USB ammeter to obtain them it would point to a faulty battery.

The first rule in board repair is to rule out parts. From experience an iPhone 7 with battery health at 87 and below will cause this problem.

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Perhaps one of two things has happened.

1) A malicious program is on your phone draining the battery

or

2) Your battery is faulty, even though the life is at 83% it could just be bad.

You may just want to get a new battery.

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I've said, that I've tried resetting it multiple times, so that means malicious program is not the cause, also the battery is perfectly fine. I think you commented without even reading what I've written. The iPhone draws 140mAmps when locked or off, it's shouldn't draw a singe mAmp when fully charged.

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It appears that you are right. I did not notice that you tested the voltage, forgive me for missing that. So, if that’s the case. The only thing I could think of is to use a testing app to test the iPhone. TestM Hardware is the one I use. But that’s all I can think of. Hope you can fix it.

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