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Subject: Re: Hot iPhone 13 lost a lot of battery power within 3.5 hrs.
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From: *Hemidactylus* <ecphoric@allspamis.invalid>
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Alan <nuh-uh@nope.com> wrote:
> On 2024-08-03 16:47, Ant wrote:
>> Jolly Roger <jollyroger@pobox.com> wrote:
>> 
>>>>>>>>> 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.
>> 
>> I didn't know it was overheating and draininage battery in it until after
>> getting home.
> 
> Are you seriously suggesting you've never seen one of the numerous times 
> it's been mentioned that immediately after an iOS update there can be a 
> surge in activity?
> 
The recent update didn’t impact my battery drainage much if at all.