Cellular Modem battery drain

Iphone 12 on IOS 16.5.1


I am suddenly experiencing high battery drain which I've tracked to when a SIM card is in use. I'm charging every night, turned off 5G, restricted location services and background app updates. Checking app usage in battery settings. I live in a 4G area and signal strength is good.


For several months after purchasing this renewed phone I would get ~45% drain after 18 hours of average use and then recharge overnight. Suddenly, I now use 100% of the battery after 14 hours.

The phone will not last a whole day between charges.


If I remove the sim, battery drain returns to normal.


Is this a hardware fault? Could it be an update fault? Can it be rectified?


The phone is effectively useless without carrying a power-pack or finding a charge point. This issue has been covered so many times before but I've not seen valid solution.


If anyone has suffered this and solved it I'd be grateful to hear how.



iPhone

Posted on Jul 27, 2023 2:03 AM

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Cellular Modem battery drain

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