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Released September 25, 2015. Model A1687/A1634. Repair of this device is similar to previous generations, requiring screwdrivers and prying tools. Available as GSM or CDMA / 16, 64, or 128 GB / Silver, Gold, Space Gray, or Rose Gold options.

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New battery causing phone to be slow under 10%

So I recently decided to put a new battery in my IPhone 6s Plus as the old one wasn’t holding charge. I ordered a battery from another source and installed it. However, when my phone would get below 10% battery remaining, it would become very slow. As soon as I would plug it in it would work like normal. I figured this would be from a inferior battery, so I ordered one from iFixit. However, the new battery does the exact same thing. Does anyone know why I’m experiencing this and how to fix it?

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Check the Battery settings and see if this applies to you:

https://support.apple.com/en-us/HT205234

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No, I’m not turning on low power mode. As soon as my phone gets below 10% battery, it becomes very laggy and unusable until I plug it back in. This didn’t happen with my old battery

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I have the same problem as well. Did you find a way to fix it?

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Sorry, I never found an answer. Just living with it as it only happens when the battery is low. I'm sure there is an answer out there somewhere but I haven't found it yet.

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Same thing happens to me but when I hit 6%

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Yes, it is very frustrating as the phone becomes unusable. Hopefully someone will stumble upon an answer.

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It started doing it at 35% now ugh

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Replace it again, if the problem persists, feel free to tag me in a reply that you have tried the part, because we could possibly be looking at something super fun :)

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@toreskey I'm on my third replacement battery! The first two were from different suppliers but the current one is from iFixit, and they all have the same proble for me.

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Are you able to get me a very close picture of the battery connector on the logic board of the phone?

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Add another of this issue, I only noticed it recently, because I rarely let my battery get under 50%, but somewhere between 10-20% this slow down is kicking in for me with an ifixit supplied battery, not particularly happy.. especially as a month later apple did the cheap battery replacement programme.

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When you go below 20% and notice the lag can you try running Lirum Device Info Lite and check if it reports your device as using 100% CPU? That is what mine does but not sure why yet. Mine is an iPhone 6S, iOS 12.1, battery from ebay with apple logo covered with marker pen.

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at %50 my CPU is %100. When I connect to power source CPU goes down to %20-25. IOS 12.1, 6s+, OEM battery (it does not show battery info in setting)

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i had the same problem, i resolved it by doing a back up and restoring the backup.

i suppose it can work by updating the ios too

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What probably happened is that the connector that you connect the battery to on the logic board is damaged. Either you can replace the logic board, which I would say isn’t worth it, or you can go to a logic board repair shop (there are a lot of them on eBay).

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I believe that there is a bug (or a feature!) in the iOS kernel that when the battery level is low, it attempts to send commands to the battery which fail on non-genuine batteries, causing the commands to be sent repeatedly, causing the kernel to use 100% CPU and lock the phone’s UI up, and in my experience if I do manage to get a call out the audio is choppy. My solution was to find a genuine used battery from a reputable seller on eBay that deals in iPhone recycling, unfortunately with this particular seller it is pot luck to find one with a good health value.

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I will suggest you to change this one and try new one. I hope this will work. All the best!

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Lucas Idstrom zal eeuwig dankbaar zijn.
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