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Released on September 24th 2021, the iPhone 13 mini is a smaller version of Apple's iPhone 13 and is the second mini iPhone. It features a 5.4-inch OLED, an A15 Bionic processor, and dual rear cameras.

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Newly replaced iPhone battery still draining quickly with little use

Hey all, successfully replaced the battery on my iPhone 13 mini yesterday because my old battery wasn't holding much charge (e.g., draining to below 50% before 9AM). Much to my dismay, my newly replaced battery followed a very similar pattern today (first full day with the new battery) - drained to ~50% by 9AM and I've had to keep charging it throughout the day. Have taken several steps to reduce background app usage/etc, but even with no apps open and limited use, the battery is draining quickly. Halp! Could this issue be fixed with "calibration"...? Other ideas? Thanks y'all.

Update (08/10/23)

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Just for reference, here is the battery life draining today with minimal use of the phone (especially between 6-9AM).

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Stephen, out of curiosity, what did your battery replacement consist of? Generally on phones after the iPhone XS you have to transfer the BMS from the old battery to the new one, and after the iPhone 11 you can no longer reset the battery health information without using what's called a tag-on flex board.

If you didn't reset the health information then the phone is still using the old data to judge the battery performance and will definitely not be accurate.

Update (08/10/23)

I am currently working with Alisha (@flannelist) on putting together as much information as we know about battery replacement on iPhones.

My understanding is that you are probably getting a pop-up warning that the phone can't be sure the battery is genuine or not, and a more extensive warning that appears under the battery information tab in Settings.

In addition, the Settings will be showing that the battery information is unavailable.

Here's how battery replacement now works as best I understand it.

If you still have your old battery, you will need to peel off the stickers covering the BMS, or Battery Management System circuit board and cut the circuit board off from the battery cell. You then have two choices; you can either cut the BMS off the new battery, or you can just buy a replacement battery cell that comes without the BMS. The original BMS then has to be attached to the new cell; the recommended method is spot welding but quick and careful soldering can work.

After that you attach a tag-on flex board to the battery (it goes between the battery and the logic board). Plug the whole thing into a device programmer such as the JC V1SE or the QianLi iCopy. Use the software provided with the programmer to reset the health percentage back to 100 and the cycle count to zero.

Finally, you have to install the rebuilt battery (new cell + old BMS) along with the tag-on flex cable into the phone. The tag-on flex is permanently installed in the phone along with the battery.

Outside of paying Apple to replace the battery, this is the only method I know of currently to replace a battery and have everything work correctly the way it should. Don't you just love Apple for throwing this crap in the way of a perfectly simple repair? As far as I'm concerned, the iPhone X is the last reasonably repairable iPhone there is; at least you can replace the screen and battery without jumping through hoops.

Here's a video showing the whole process being done on an iPhone 11 Pro.

iPhone 11 Pro AmpSentrix Core Battery Repair with Tag on Flex - YouTube

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Thanks, Jerry. Hmmm... replacement was only the battery. Followed the ifixit guide for the 13 mini model (and used their kit) and it didn't mention anything about BMS or health information... 2 Questions: 1) Anything else you can tell me about this "tag-on flex board"? Worth my time to think about doing something additional? and 2) If the phone is using old data... battery info won't be accurate... will my phone still die when the battery hits 0%? Or will the Frankenphone have a life of its own now? Thanks a lot.


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“Recalibrating” the battery as you describe didn’t work. Fortunately, I received a suggestion at the Apple Store (of all places) to try restoring the phone to factory settings (after backing up). Worked instantly and was able to reload all my apps/etc and the battery is like new.

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Hi Stephen,

You don't need to go the route of disassembling, spot welding & tag-on flexing your battery for it to work properly. The tag-on flex is only for the purpose of restoring and displaying apple's overall battery health information. Following the iFixit instructions to install a new battery should restore your phone's daily battery life to the way it was when you first bought the phone (not dropping to 50% by 9am).
It's possible that your new battery simply needs calibrating. Try using your phone until the battery drains completely and turns off. Then charge it to 100% and leave it plugged in for an additional 2 hours. This should teach your phone to recognize your battery's true 100%, and true 0%.

If your phone continues to drain quickly, it is likely one of two things:
#1. Your replacement battery is defective.
#2. Your phone has a hardware problem that is draining your battery. A micro-soldering professional can help with this.

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Stephen Wechsler zal eeuwig dankbaar zijn.

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