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From: Chris <ithinkiam@gmail.com>
Newsgroups: misc.phone.mobile.iphone
Subject: Re: Hot iPhone 13 lost a lot of battery power within 3.5 hrs.
Date: Thu, 1 Aug 2024 22:11:07 -0000 (UTC)
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Ant <ant@zimage.comANT> wrote:
> Chris <ithinkiam@gmail.com> wrote:
>> Ant <ant@zimage.comANT> wrote:
>>> Hello,
>>> 
>>> Weird/Odd. Hot iPhone 13's iOS v17.6 (updated from iOS v17.5.1 
>>> yesterday) battery power percentage dived from recharged 88% to 23% from 
>>> 6 PM to 9:30 PM while out to eat dinner in a crowded restaurant and 
>>> commute to there and back home. Battery statistics said it was hot to 
>>> recharge at 88% max. Usage shows "Find My" and weak cellular using half 
>>> in the background for the first hour, but after that was just "Find My". 
>>> Battery health shows 89% which is normal for this iPhone from 2/1/2022. 
>>> What's going on? Is this a new bug or something? :/
> 
>> Higher than normal battery drain is expected with a new version of ios as
>> the caches and indexes get refreshed. 
> 
>> Give it a day or so to settle down. 
> 
> Is it supposed to run even when on battery only when not at home? It 
> would had been nice if it happened when connected to a power charger at 
> home. :(

It's normally not an issue and runs in the background. Occasionally it
drains more than normal for whatever reason. You seem to have hit one of
those occasions. 

Actually, you also mentioned weak cellular signal which is very effective
at draining battery power.