iPhone 15 charging optimization limit exceeds 80%

Today my iPhone decided to charge above 80% limit (which usually works fine) and charged to 100% at night. Around 3 am. Then even it was still connected to the charged it has lost 10% in just 3-4 hours. Usually I lose same amount during whole night. 

It looks like iPhone decided to charge to 100% but then realized that 80% limit is on so started to drain more and more just to reach 80%. I don't know what is going on. 

I am also wondering why I see status that iPhone right now is charged to 80% while in fact it is still above. I decided to turn off 80% limit for now just to reach full 100% because I was worried that something is broken and iPhone won't stop draining

I have the same problem. I am using the USB C cable and adapter that came with my M1 MacBook pro to charge my iPhone 15 pro max. I've selected 80% limit for charging but it goes beyond 90% if the charger remains connected. The charging should ideally stop after 80% is reached.

I had similar issues when I first bought my iPhone 15. It turned out the problem was with the charger brick I was using. Once I changed the charger brick, the issue stopped, and I've had peace of mind since then

I’m having the same problem. My iPhone 15 charged until 82% and the 80% limit optimization was on the battery level went to 87% after restarting my device. Plz reply if someone knows why this happens and how I can fix this issue. Is it an iPhone problem and should I get it exchanged?

Thank you for the update. Apple really needs to fix a few things honestly. I’m also not happy with the iPhone 15 flashlight. My iPhone XS had a better and brighter light and with the 15 it looks pink. Then now the whole battery and charging issue.

My 15 Pro is only 4 weeks old I am on the 80% Limit but lately it now surpasses the 80% limit. I’ve tried toggling it off and on again but it still sometimes surpasses. Does anyone know a fix to this?

tldr : the 6% excess in charges is needed for the battery to complete 1 charging cycle.

I might explain this badly but hope you can understand. To avoid getting your battery being charged more than 80%, best tips is to always start charging at 20%. You can try this and confirm later.

The logic behind this is charge limit refer on the charge cycle. Battery being charged from 0%- 100% in one charging session considered to be charged by 1 cycle. If you charge from 20% and the battery limits the charge at 80%, your charge cycle is incomplete. In charging electronics battery terms, incomplete charging cycle is good while complete charging cycle is bad.

Is it ok to charge my iphone to 100%? , i updated my iphone to ios 18 and it didn't stop at chargingat 80% i thought it was a bug but it keeps on going and i noticed that it become laggy and drain faster than before and it only allow to optimize when i choose the 100%.. (btw im using iphone 15plus)

Is it ok to charge my iphone to 100%?

Of course. iPhones have been doing this for many years. Just make sure that you have Optimized Battery Charging enabled.

Connect the phone to the power supply at night and leave it connected all night....every night.

I've always been able to get 4-5 years use from the battery using this method. If the 80% option might result in a few more months use from the battery, I could care less.

I start every day with the battery at 100% and can get 2-3 more hours from the battery that way compared to an 80% limit, which in my opinion is more of a gimmick than a benefit.

It seems on my iphone that the battery % show the % of max, if I set max charge limit to 80% then the 100% shown on the battery icon means 100% of 80%... i.e. 80%

Go to the settings and you will see the graph of actual % for last 24 hours or 5 days.

This is not a bug.

charging cycles are like this. The phone needs to keep the battery healthy and sometimes it need to charge it more than the set value you have to stress the battery to keep it lasting as long as possible.

happen me a

couple of times but nothing dangerous. Can doh be annoying.

I got my iPhone 15 in September and have it set to 90 max. Today for the first time it went to 99, restarted the phone, and now it’s 100%. Call me crazy, but it seems like Apple loves to push updates that temper with their phones for their benefit.. Think about it; they want to sell newer models, they push an update that “accidentally” bugs the charging settings in order to drain your battery, forcing you to eventually get a new phone, at your expense, because of their software…

I have the 16 Pro and it indeed randomly charges to 100% way over my 85% setting limit!

UPDATE: I have read some of the previous posts and it appears that random charging to 100 is not a bug but it is done by design. Thanks.

I got my iPhone 15 in September and have it set to 90 max. Today for the first time it went to 99

The battery should have gone up to 100% a few times already, and may have likely occurred without you noticing. This would be normal and expected no matter where you had the charge limit set for.

The reason for this is explained in multiple posts on this thread. Please take a few minutes to read them.

Charge limits.......the current "gimmick". I just saw an article on the Internet that claimed that the upper limit should be set for 72% and lower limit 26% to double battery life. That is funny.

Of course, you had to buy the "special software" to allow this and the article included a link for this.

I also have the same problem. I have the battery limit set to 80% but it still charges to 100%. But it does not always. Just sometimes.