My iPhone 15 Pro Max heats up when charging

I have recently bought 15 pro max. But my phone heats up when charging. Its not normal on a new phone as i have used all apple genuine charging adapter and cable.


[Re-Titled by Moderator]

iPhone 5, iOS 9

Posted on Nov 1, 2023 9:02 AM

Reply
Question marked as Top-ranking reply

Posted on Oct 25, 2024 5:40 PM

hukalatorium wrote:

I wish there was a way to adjust charging speed with a setting.
This issue only occurs when using a modern charger with high power. Charging with the power adapter that came with older iPhones and a USB A to C cable does take longer, but the phone does not heat up much at all.

It’s called the Second Law of Thermodynamics. Anything that creates or uses energy does so with some loss. That lost energy is expressed as heat. So when you charge the phone it generates heat in the power source, heat in the charger circuit in the phone, and heat as the energy goes into the battery. The faster the charging, the more heat is generated. Likewise when you discharge the battery; not all of the energy from the battery gets to the circuits that use it. Some of it becomes heat. In particular, fast charging with a 20 watt power source will cause any smartphone to get very warm, so warm it may have to pause charging to cool down after 30 minutes or so.


This won’t do any harm to the phone, but if you don’t want it to happen use a lower current power source or charge wirelessly.

55 replies

Oct 25, 2024 6:17 PM in response to Lawrence Finch

I understand why it happens, it's just that charging at high temperatures degrades lithium ion batteries faster.

I have no need to charge quickly, so - as you said - I pick out lower-wattage power adapters, but I wish I didn't need to. The device can decide how much power it accepts or to pause charging entirely - this last part was even exposed to users of iPhone 15 and up, you can set a charge level limit now, to extend battery longevity. A similar setting could and in my opinion should exist for charge speed.

Dec 8, 2023 5:32 PM in response to 43_sujan

Apple had the audacity to call me back after an hour and a half of discussing to tell me that this was normal. (obviously did not accept that answer and had them schedule me to have it checked out at Apple Store) I have a brand new one day old from December 7 iPhone 15 Pro 256 GB. (On iOS 17.1.2) Phone gets piping hot when plugged into Apple OEM cable charger. Seems to be fine with wireless charge. Prior phone was iPhone 12 Pro 256 GB. No issues. Lawrence, what a kick the can down the road kind of answer to blame everything on everything. Why was everything good with my 12 Pro and now the 15 Pro immediately overheats. This is bad.

Oct 25, 2024 6:51 PM in response to Lawrence Finch

You can't stop battery degradation entirely. It's not a binary thing which only happens above a certain threshold. The higher the temperature while charging or discharging, the faster the loss of capacity and the charging temperature limit that was chosen is too high for my liking.

Look up "Effect of Temperature on the Aging rate of Li Ion Battery Operating above Room Temperature" on Nature to find some numbers on that.

Dec 8, 2023 5:54 PM in response to Lawrence Finch

I understand that logic. The simple truth is , It’s very simple, The fact that my iPhone 12 Pro did not overheat whatsoever and now all of a sudden the 15 pro overheats. Sorry, gets piping hot is NOT normal period. I’ve had eight iPhones and have 13 Apple products. In fact, did a test with my dad’s iPhone 15 and is as cool as a cucumber. This may be a 15 pro issue.

Jan 29, 2024 6:41 PM in response to 43_sujan

Me too , switch all the APP ,WIFI , Data , still super hot. i am very sad from the day 1 i have this iPhone 15 pro max. within 7 days, the shop studio don't accept return or change.. i spent 2000SGD plus , i hate this super hot apple phone. i went to Apple customer service, their technical said, " hot is normal, mine is same as yours".

How to do ? i went to the studio shop and apple service center at orchard road, Wasted my time and energy, nobody can help........

Jan 29, 2024 6:43 PM in response to IphoneProMax15

IphoneProMax15 wrote:

Me too , switch all the APP ,WIFI , Data , still super hot. i am very sad from the day 1 i have this iPhone 15 pro max. within 7 days, the shop studio don't accept return or change.. i spent 2000SGD plus , i hate this super hot apple phone. i went to Apple customer service, their technical said, " hot is normal, mine is same as yours".
How to do ? i went to the studio shop and apple service center at orchard road, Wasted my time and energy, nobody can help........

I guess you too did not read the answer already posted in this message thread.

Jan 29, 2024 6:52 PM in response to Lawrence Finch

it is super super hot when charging the iPhone 15 pro max, it is totally not normal..... switch all running APP , WIFI, flight mode , still super super super +++ hot. I bought recently , i extremely dislike /hate this phone. no help from Apple company.

I can only write my feeling here as they don't accept return or change to another phone even within 7 days.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

My iPhone 15 Pro Max heats up when charging

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.