why is the iphone 15 pro max battery life so short

Maybe because you are using it constantly, as its new. Or it hasn’t finished its background process of indexing content after the content move from the old phone. Or you’re not following best practices for charging.

The absolute best way to get maximum use on a charge, as well as slow the decline of battery capacity long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. If you enable iCloud Backup (Settings/[your name]/iCloud - iCloud Backup) the phone will back up overnight also, assuring that you can never lose more than the current day’s updates. Here's more information→About Optimized Battery Charging on your iPhone - Apple Support

If you charge overnight the battery should last through the day until the next nightly charge. If it does then it is working normally.

As you apparently didn’t read the thread you posted to before reading it, I will repeat the answer I posted:

Maybe because you are using it constantly, as its new. Or it hasn’t finished its background process of indexing content after the content move from the old phone. Or you’re not following best practices for charging.

The absolute best way to get maximum use on a charge, as well as slow the decline of battery capacity long term is to enable Optimized Battery Charging (Settings/Battery/Battery Health) and charge the device overnight, every night. The battery will fast charge to 80%, then pause. During the nighttime pause the phone will use mains power instead of battery power, allowing the battery to “rest”, and thus reducing the need to charge the battery quite as often. The phone will resume charging to reach 100% when you are ready to use your phone; it will “learn” your usage pattern. If you enable iCloud Backup (Settings/[your name]/iCloud - iCloud Backup) the phone will back up overnight also, assuring that you can never lose more than the current day’s updates. Here's more information→About Optimized Battery Charging on your iPhone - Apple Support

If you charge overnight the battery should last through the day until the next nightly charge. If it does then it is working normally.

Go into settings and turn off the background app refresh. That’s fixed mine.. the first day I had my phone it was at 40% before 11am after having a full battery at 6am- and that’s without really being on it... Now my phone lasts over 24 hours with heavy use

I encountered a similar problem with my iPhone 15promax. I recommend examining the screen time and battery usage to address the issue. It's common for a new iPhone to use more battery power in the initial days.

inioluwa290 wrote:

Because of the way you use your battery

you may be over charging it

Nonsense. It is impossible to overcharge an iPhone battery, because the charger circuit in the phone monitors charging and stops when the battery is at 100%.

The best way to charge an iPhone, as recommended by Apple, is to plug it in overnight, all night. This also enables automatic nightly backup, so if disaster strikes you can’t lose more than a day’s content.

I am having the same problem with my new iPhone 15 pro max. I had an iPhone 13 Pro Max prior to this one and battery life was great even though it was 2 years old already. How can this problem be addressed?

Ive noticed the same problem with my iphone 15 pro max. My 13 pro max got simulair or better battery even when it was two years old.

Also optimized battery charging is by default turned on for all iphones. Changing this setting will not fix op’s battery consumption. Just the battery health over time might he affected my changing this setting.

I have done all of this and I still have to charge it at night and during the day. I just got my 15 pro max 4 days ago. my 13 that I traded for this one didn't have to be charged like this. My friend that got her 15 pro max in October has been dealing with the same thing since she got hers.

Upon checking Battery Level And Usage by App, "Home andLock Screen" kept draining the battery even when the Phone was not being used. After charging my battery to 80%, I unplugged it, went to sleep, when I woke up after 4 hours, the battery was at 69%. I turned off Background App months ago. I even killed the apps before locking my phone. It's so frustrating. My 13 Promax's Battery Health was at 85% after more than 2 years, but the battery lasts a whole day of heavy use.

Because of the way you use your battery

you may be over charging it

I’m also very disappointed im coming from 11 pro and now I have 15 pro max.I charge the phone until 80 procent and its takes line 4 hours until I get 20 procent capacity , is that normal???

thank you

It is very frustrating. I just got my new phone 4 days ago and have had to charge it 8 times. I had the 13 prior like you and didn't have this issue.

My iPhone 15 is a month old, and it drains as quickly now as it did when I first got it.

I concur. 98.97% sure that what he said is true and I will back that statement until the cows jump over the moon…