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SUI-DriverX
User level: Level 1 (14 points)

iPhone charging extremely slowly since iOS 27 update

Hi @all :-)


Since updating to iOS 27, my iPhone has started charging extremely slowly.


Before the update, all of my existing chargers, cables and charging stations worked normally. Since the update, the iPhone often shows “Slow Charger” / “Slow Charging”, and overnight charging no longer seems to bring the battery anywhere near 100%.


For example, one night the phone was connected for several hours but only charged from roughly 10–15% to around 50%. The same issue happens with different charging setups, both at home and at work.


I have tested:


  • different charging stations
  • different cables
  • wired charging
  • wireless/Qi charging


The important point is that all of these setups worked normally before iOS 27. The problem started immediately after the update.


Has anyone else experienced this since iOS 27? Is this a known bug related to charging, power negotiation, battery management or background activity after the update?


Replacing all charging cables and charging stations I own cannot and must not be the solution, and therefore is not an acceptable suggestion.


Any ideas or similar experiences?


Greeeezzzz :-)

Posted on Sep 17, 2026 5:47 AM

7 replies

jacoby0824
User level: Level 1 (14 points)

Oct 3, 2026 3:06 AM in response to SUI-DriverX

 I completely understand the frustration, but it sounds like the issue might be related to using lower-wattage chargers or standard Qi wireless pads. While these worked fine before, iOS 27 is a massive, crazy update with a lot of under-the-hood improvements!

After updating, the phone has to go through and organize absolutely everything on your device—your photos, messages, emails, and more. This background indexing takes a couple of days to finish, especially when connected to Wi-Fi and locked on the charger, which temporarily slows down charging.

If you are using a cheaper or lower-watt charger, the phone might struggle to keep up with both the indexing and charging at the same time. While it's completely okay to use what you have on hand, investing in a higher-wattage charger can make a big difference. iOS 27 definitely takes some getting used to, but once it settles in, it's a really great update!

SUI-DriverX Author
User level: Level 1 (14 points)

Sep 17, 2026 11:43 PM in response to LD150

Thx :-)


The device restarted after the update, of course.

I actually assumed that would be enough. Far from it... ;-)


After two days and two restarts each... things have finally settled down.


Greeezzz

LD150
User level: Level 10 (107,674 points)

Sep 17, 2026 6:22 AM in response to SUI-DriverX

The thermal stress of any heavy software action including an update can trigger an already failing hardware component to fail completely. Fact. Nobody's fault.

The last straw breaks the camel's back.


First force restart, if no better have Apple look at it.

aashmansingh_4
User level: Level 2 (338 points)

Sep 17, 2026 6:29 AM in response to SUI-DriverX

Hey! Try restarting your iPhone first. If not, then try clearing out storage, if not better, hand it over to Apple to have a look at it.

Daniel Baldessar
User level: Level 1 (8 points)

Sep 28, 2026 7:31 PM in response to SUI-DriverX

Estou com esse mesmo problema, cerca de uma semana após atualizar para o iOS27. Hoje atualizei para a nova versão do iOS 27.0.1 e também não resolveu. Eu fiz os mesmos procedimentos de testes que você fez e não resolveu, inclusive com um carregador original Apple de 40w.

aramap
User level: Level 1 (8 points)

Nov 9, 2026 5:09 AM in response to SUI-DriverX

I experienced the same thing. I used different chargers, cords, outlets and ports with the same slow charger message. It definitely was not the battery; the battery health was fine. I put it on a wireless charger last night and it charged. I’ll see if I can charge it with a plug-in charger.

LD150
User level: Level 10 (107,674 points)

Oct 3, 2026 3:10 AM in response to jacoby0824

I completely recognise an AI response, please quote your source.

Originally posted at discussions.apple.com/thread/256358929