The Apple iPhone 5s was announced on September 10, 2013. Repair of this device is similar to the previous models, and requires screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Silver, Gold, and Space Gray.

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Battery replaced multiple times

We had a customer come in months ago for a battery and charging port replacement. After looking at his phone we determined that was the correct course of action. We replaced both. A month later the same customer came back with the same issue -- the phone won't turn on and won't take a charge from the cable, he can't get it to do anything again. We again replace the battery (not the charging port) and everything is fine again. We were able to charge and use the phone before it left. Now a bit over a month later the customer is coming back with the same issue AGAIN. We have used iFixit parts and have not had any other issues with any other phones. The liquid indicators are not showing any kind of liquid. Now that we've replaced the battery yet again the phone is also very fluttery when it is on. Not sure what to check or do next? Not sure why he would keep going through batteries like that?

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Has the customer said "it never worked properly" or "it just died again".

I assume the phone worked well in the intervening month, at least a few weeks of those months. Because if the phone never really worked properly, then you may have bad replacement batteries (although the iFixit batteries are very good).

Have you tested the batteries with a battery utility, such as coconutBattery (for Mac) or 3uTools (for Windows). It will tell you what the health of the battery is. Anything less than 70% of design capacity will require replacement although considering they are essentially new, they should be well over 90-95% design capacity and no more than 30 charge cycles.

If the batteries look good and have very few charge cycles, which they should, then I suspect the may be using a cheap charging brick which could be damaging the batteries. Worse case scenario, the charge circuit on the phone may be defective but this would require a micro-soldering repair.

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Did you ask the customer if the battery ended up going flat then not being able to charge again?

That's a sign of a bad charging ic that needs to be replaced by someone that is experienced in microsoldering.

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You confirmed what we are thinking too. Thank you.

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