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Released November 4, 2017. Model A1865, A1901. Available as GSM or CDMA / 64 or 256 GB / Silver or Space Gray. (Pronounced the same as "iPhone 10.")

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How to reset Maximum Capacity with New Battery

Hey there,

I replaced a battery on a customer's iPhone X with a ampsentrix battery. Also used my icopy2 programmer to program the new battery.

I got him to try performing a full drain and charge to calibrate it with no luck. He even did it twice.

How can the "maximum capacity" be reset?



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did you switch over the bms board, i dont think icopy can reset battery capacity


@tech_ni All i did was install a new battery with icopy. Is there no solution for this?


@willie604 could depend on the ios, i know newer models need the bms board from the original battery transferred to a new battery cell and programmed in some cases using a tag on flex



Hey, Ive confirmed with the phone owner that he has os 16.3.1.

I still have his old battery as well.

So would transferring the battery circuit help achieve resetting the calibration?

What do other people do. Or tell there customers?

Thanks for your help


@willie604 probably wouldnt help as you need a certain program to reset health and cycle count


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Wow thanks guys i was able to reset the battery back to 0 Cycles and 100%. At first i tried to reset the percentage without resetting the cycle count and it didnt work. but as soon as i did both it worked.

So so like you guys are saying this might not be possible with Iphone 12 and up without a spot welder? ANyone have links to more info on this?
Or perhaps the battery adaptor boards that came with my Icopy will help as "Jerry W" mentioned

Here is how to get software and update Icopy

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Hi Kevin,

Yeah, according to REWA, starting with the iPhone 11, you can no longer reprogram the battery health information, so even if you change the BMS, it will still show the old health percentage and cycle count.

It's not clear if you have to buy a new Qian Li tool, the Copy Power Battery Data Corrector, or if you can still do this operation with the standard iCopy; I think the latter, but I'm not sure. As far as I can tell support stops at the iphone 12; for 13 and 14 owners it appears you're out of luck.

You also need the little tag-on boards that get connected to the BMS and left inside the phone; they add about $7.00 USD to the cost. In theory that should be made up for by the fact that you can buy battery cells without the BMS to use for those repairs.

Anyway, here's a link to the video; the iPhone 11 and 12 part starts at about the 4:00 minute mark.


Oh yeah, and congratulations on getting the situation figured out, Kevin! Nice work, my man!

I wonder if the original copy from the old battery took along the original battery health information? I've done quite a few iPhone X batteries and haven't ever used the iCopy on them; I just replace the battery and it all seems to be fine.



Wow great video Thank you:

Thats interesting that it helps to boot from fake battery boot cable before reinstalling the actual battery. I just happen to have bought a set of those.

That makes sense if you did nothing to a new battery on an older iphone it would work. I used the icopy because i wasnt sure if the phone would give warnings about a 3rd party battery.

But it totally copied over the cycles and health as well :$

I attached a picture of all the battery flex cable that came with Icopy. They are from 11 to 13PM. Kinda makes you wonder if it would work, Or if you would need the "Copy Power" tool. The "copy power" programmer seems to use the same software as the Icopy, makes me wonder even more if the icopy is capable,

I did buy my Icopy in the past 6 months so perhaps its a newer version that can do same as copy power. Who knows though.

Here is bonus trick for fooling the iphone i found in my searches. See @ 3:33


@willie604 Looking further into the tag-on connectors, many of the shops selling them advertise that they are compatible with both the iCopy and the Copy Power, so I'm assuming they'll both work. Since they seem to be selling the Copy Power much cheaper than the iCopy, I assume its more of a single-purpose device just for batteries, but otherwise works exactly the same as an iCopy.


@dadibrokeit Thanks for somewhat confirming this, ill try to remember to report back here when i get an 11 iphone or newer battery. I only have X and older batteries


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Hi Kevin,

I have an iCopy myself, but haven't really made use of it yet. In the process of familiarizing myself with it, I've gone through a few YouTube videos and tutorials and ran across one that I think will be of interest to you.

Basically, it shows the process of replacing a battery on an iPhone XR. The main focus of the video is showing how to get rid of the "genuine battery" warning, but part of the process it shows is reprogramming the battery health to 100% and the cycle count down to zero.

Now, it's my understanding that the batteries for iPhones X, XS, and XR can all be reprogrammed. The X does NOT have the genuine battery warning; that started with the XS. Apparently, starting with the 11, Apple began encrypting the cycle count and health percentage, meaning it could no longer be reprogrammed. Aftermarket manufacturers have come up with a little converter/adapter board that plugs in between the battery and the motherboard and allows the stats to be reprogrammed.

Here's the video I was referring to.

iPhone XR Battery Replacement - No Error Warning, 100% Life, 0 Cycles

Since your X doesn't have the genuine battery warning, you don't need to change the BMS. However, at about the 4:00 minute mark, you'll see where they plug the battery into the iCopy and the iCopy into a computer that's running the Qian Li software. Using the software, they show you how to reset the cycle count and health percentage and write back out to the battery.

As I mentioned, this is on an iPhone XR, but I don't see any reason why it wouldn't work the same on a X.

This is all based on my current understanding of how the iPhone batteries work now and I could be wrong, but I think all you have to do is plug the battery in with the iCopy connected to a computer running the Qian Li software and you should be able to set those numbers to whatever you want.

The part that actually puzzles me is wondering why a brand new battery would be coming up with a health value of less than 100%. That should be the baseline where it starts. so I don't understand why you're having to reprogram it in the first place. What does the cycle count show?

Anyway, I'd love to hear whether that works or not since, as I said, I have an iCopy too and want to know how to use it.

EDIT (3/24/2023)

Updated to reflect that battery encryption started with the 11, not the 12, so 11, 12 and 13 all require tag-on boards to be able to modify the battery health information. That can be done with either the Qian Li iCopy or the Copy Power programmer. I have not seen any support for the iPhone 14 as of yet.

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what is it you want to do with the icopy, i had 1 and ended up selling it as i never used it because i dont really offer screen replacement, i stick more to board repair


@tech_ni I do all the repairs for my extended family and they're all iOS people so I'm supporting iPhones from the 6 through 13. With kids in the family, you can bet there are going to be broken screens, so that was the primary impetus for getting the iCopy; supporting screen replacements.

With the new battery requirements in the 12 and up, it looks like I'm going to need a spot welder too. It looks like Qian Li has a new battery-specific tool out made for iPhone 11 and above.


@dadibrokeit jerry i hear phil (cod3r) mention you now and again, i dont do screen programming buddy, i offer take it or leave it. to many people under cutting prices for screens so i nearly refuse to do them


@dadibrokeit This guy did it with a soldering iron. Though mobile sentrix has a spot welder for $50 seems reasonable


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