iOS 18.3 battery drains on iPhone 13 Pro Max

This is normal. After an update, certain related tasks including indexing may continue in the background, in which you may experience an increased battery drain. When the update is fully complete, your iPhone will return to normal conditions.

Please also read my User Tip: Addressing the Common Increased Battery Drain and Thermal Temperature Conditions Your iPhone May Face After Setup and Updates

aswin246 wrote:

Is there anyway that i can claim free battery replacement. Because after 18.3 update my battery is draining quickly.

If your phone is under warranty (either the original one-year warranty or Apple Care) and the maximum capacity has dropped below 80%, Apple will replace it at no cost.

You can contact Apple and arrange for diagnostics here:

Genius Bar Reservation and Apple Support Options - Apple

Well, no matter what issue you have, with 2 billion iPhones in use around the world there is certainly going to be someone else with the same issue, but knowing that won’t help you solve it.

This user tip might, however→The last update killed my battery! - Apple Community

Bikergofast wrote:

Has it improved since you posted? I'm looking for evidence that 18.3 isn't worse on batteries than 18.2 before I update. Especially with Ai features being added all the time.

Every iOS release that has come out has ALWAYS been worse on batteries (if you believe posts in this forum) than the previous release. It’s a wonder you even get 5 minutes after 17 years of updates.

It probably will be worse for a few days after the update, because it needs to update and sync its databases. But that is not a reason to avoid updating, considering that 18.3 fixes 28 potential and actual security vulnerabilities.

its taking forever to charge 70%, it took 10 hours to charge that much and its not draining for me that fast but not able to fully charge. My battery health is 84%

I’m not sure why it’s taking weeks to “complete” an update on my phone. The battery is literally going down as I look at it sitting there on the table. The only thing I request of Apple these days is that they just stop already. Instead of doing updates that mean nothing to most people maybe they could actually make a voice to text that works, or a mail system that actually deletes a message as one swipes left and doesn’t show one the same email every single email one opens thereafter? Maybe these are some the things that Apple could work on instead of making new puppy emojis or doing stuff that 92.4% of individuals who use Apple iPhones can appreciate…without exponentially draining their batteries and increasingly ruining their iphone experience with every new update?

RenchyBasa wrote:

Thank you kindly Zachyy! I appreciate your advice.

You’re very welcome! Depending on the amount of data you have, this should usually take a few days. Have a great weekend!

RenchyBasa wrote:

Thank you kindly Zachyy! I appreciate your advice.

Which was the top suggestion in the link I posted.

Has it improved since you posted? I'm looking for evidence that 18.3 isn't worse on batteries than 18.2 before I update. Especially with Ai features being added all the time.

I don;’t know what a mail breach has to do with battery life. I suggest you start a new thread for this totally different issue. Click on the Ask the Community link at the top of this page.