iPhone 15 Pro Max Battery Health Dropped To 99% In Less Than A Month

My brother and I purchased the new iPhone 15 Pro Max when it released in September. At the beginning the iPhone was overheating even when charging. I also noticed that the battery would drain very quickly. I charge my phone up to 85-95% & only charge it to 100% when I know I will be out & about all day. But most of the time even if I do go out all day the max I charge the phone to is 95%.

I checked my battery health and it says 99% which is insane & NOT normal for a brand new iPhone that’s not even 2 months old. My brothers phone is at 100% on battery life and he is CONSTANTLY on his phone.

I’ve contacted apple and they have done their little test and shows that everything is fine but they don’t give an explanation as to WHY the iPhone has dropped to 99 in less than 2 months as well as to why the battery drains so quickly.

My iPhone is also updated to the latest IOS 17.1

I’ve had iPhone since the 4s & this is the first time I have experienced my iPhone battery health dropped to 99 in less than 2 months & the battery draining quicker than my old iPhone 13 Pro Max that had a battery life of 83% after having it for 2 years. I have always been careful with battery health & hardly charge to 100% and have gone 1-2 days until needing to charge my iPhone.

is anyone else having this issue? Apple hasn’t been very helpful and says my phone is fine even though the battery performance has been horrible even after the new update they claimed fixed the problem. I’m still having this problem & it’s coasting the health of my battery.

I shut off all background app refresh to see if it helps & so far it seems to be doing a little ok but the fact that the battery performance has been bad I’m very disappointed with apple.

iPhone 15 Pro Max

Posted on Nov 3, 2023 12:05 PM

Top-ranking reply

Lawrence Finch

Community+ 2025

Level 10

228,996 points

Posted on Dec 17, 2023 8:16 AM

Jeff_88 wrote:

I am having the same issue, I have contacted Apple support via messages and they mentioned there is an issue with my phone and asked me if I want a replacement phone to be sent and to charge me the shipping cost or to go to the Apple store. I said I go to the Apple store, and I went there the staff told me and the manager there was no problem with my phone i asked them why they gave me an option to come here, they replied because apple online has a different procedure. they wasted my time and very bad experience.

Your battery did not drop 1%. It probably dropped 0.1% from 100% to 99.9%, because the gauge in the phone just displays the whole number, not the fraction, so 99.9% appears as 99%. But any loss of capacity is NORMAL.

Batteries are consumables; they lose a little capacity every time they are discharged, then recharged. On average this works out to about a 1% loss for every 25 “full charge cycles”. As one example, if you charge the phone overnight, every night (and that is what you should do; it is a best practice), it starts the day at 100%. If it drops to 20% by the end of the day before you charge it again overnight that counts as 0.8 full charge cycles (20% to 100%), or about 24 full charge cycles per month of use. For this example your battery capacity will lose about 1% per month. Of course, if the end-of-day level is higher than 20% the capacity loss will be a little less, and if it is lower than 20%, or you charge it during the day, the capacity loss will be higher.

Once the capacity drops below 80%, or if there is a message in Battery Health that the battery is not meeting peak performance expectations, it’s time to change the battery→iPhone Battery Replacement - Official Apple Support

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

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iPhone 15 Pro Max Battery Health Dropped To 99% In Less Than A Month

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