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From: Jolly Roger <jollyroger@pobox.com>
Newsgroups: misc.phone.mobile.iphone
Subject: Re: Hot iPhone 13 lost a lot of battery power within 3.5 hrs.
Date: 2 Aug 2024 20:11:20 GMT
Organization: People for the Ethical Treatment of Pirates
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On 2024-08-02, Ant <ant@zimage.comANT> wrote:
> Jolly Roger <jollyroger@pobox.com> wrote:
>> On 2024-08-01, Chris <ithinkiam@gmail.com> wrote:
>> > 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. 
>
>> Absolutely. When the cellular (or WiFi) signal is low, the device
>> boosts the radio power which naturally drains the battery faster.
>> Combine that with the normal post-installation indexing and cache
>> rebuilds, and you have a recipe for abnormally-high battery drain.
>
> I wished there was a way to tell iOS not to the indexes and rebuilds.

Not really, because you definitely want all of the benefits it provides.
It's been a normal part of system updates for decades. Refrain from
updating when you want peak performance. Simple.

> I know using airplane mode for disabling cellular would work, but it
> was in the purse so...

So, you couldn't take it out and turn cellular off? Not sure I follow
your logic.

-- 
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JR