Revamped version of the iPhone 3G with faster processing speeds. Repair of this device is similar to the 3G, and requires simple screwdrivers and prying tools. Model A1303 / 16 or 32 GB capacity / black or white plastic back.

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iPhone keeps restarting after battery replacement

I ordered a new battery from iFixit (delivery from US to Europe took less than two weeks, props for that) and followed the intructions of the guide carefully.

The moment of truth... I pressed the power button but nothing happened until I plugged the phone in the wall charger. Fortunately, it booted by first showing a green screen and then the Apple logo. After a minute or so, it showed the 'Activation required' message with a battery percentage of 100%. My happiness went away after a few seconds: the phone rebooted. This process just kept repeating over and over so I guessed: I'm stuck in a loop. After a couple of reboots, the battery percentage stayed on 85%.

As soon as I unplugged the phone from the charger, it would turn off as if the battery was dead. I decided to leave it in the charger for a night. Tried connecting it to the Mac this morning, it booted like normal and iTunes recognized it as a phone in DFU mode. Tried to do a restore but as soon as iTunes tried to load up the firmware, the phone turned off again and iTunes gave me a '2001' error.

So, what am I dealing with here? Dead/wrong battery? I reopened my phone and repeated every process in the guide and I'm still having the same issues. My last resort is to put back the original battery, but maybe one of you can help me out? Thanks in advance!

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It sounds like you got a defective battery. Email our wonderful support team about this issues and they will take care of you. support at ifixit dot com. Thanks!

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Thank you Scott, iFixit is going to send me a replacement.

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iPhone 3GS endless reboot after battery replacement fix

With a lot of iPhone 3GS units now requiring replacement batteries, but with no original batteries available, sometimes after a replacement when the power percentage drops to 30~50% the iPhone will turn off, but when you try to turn it back on again it goes in to an endless cycle of showing the Low-Battery screen and then attempting to start with the Apple logo, then restarting all over again in a minute or two.

The exact cause of the problem isn't known, though a mismatch between the presumed or old battery charge curve and the new battery is likely. Mostly the iOS installed thinks that the battery still has 30~50% of power left when in fact it empty, a lot of this is because lithium cells have an exceptionally flat discharge curve and thus estimating the energy left is not always practical without keeping track of the mAh consumed.

Put the iPhone 3GS into DFU/Recovery mode

Hold down the power button for 4 seconds

Hold down the home button for 10 seconds

Release the power button

Wait 15 seconds

Release the home button

Charge for 30 minutes

Exit from recovery mode

Press the home + power button for 15 seconds

Release both buttons

Press the home button for 3 seconds

The phone should now be booting into normal mode and you should be able to continue charging normally once more.

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Stefaan will be eternally grateful.
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