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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 / 8, 16 or 32 GB capacity / black or white plastic back.

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iPhone keeps turning itself off any ideas?

I'm having an issue with two iPhones at the moment both are 3GS.

The phones switch on, show some battery, then randomly turn themselves off. Can turn them straight back on again so the battery isn't drained yet they will just turn off again.

If I try to plug them into a computer/wall, they display the battery full indicator, when unplugged they don't show 100% battery (one is under 20% in the red, one is at about 30%).

I've tried using a couple of different batteries I have laying around and it just seems to be the same problem.

Any ideas?

edit - I should also add that one of the phones when a restore is attempted goes all the way through then shows error 29 as it's rebooting and goes into recovery mode. Booted it out of recovery and attempted again with the same result.

Thanks guys :)

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Sounds like battery problems. Error 29 on iPhone 3GS usually indicates incompatible battery. Before opening and during any repair of iPhone 3GS make sure the iPhone is OFF.

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Could it be that there is something faulty on the motherboard contacts that connect to the battery? As I've tried 2 batteries although one could be bad and the other is a poor third party battery.. Could try to pull a known working one out of another iPhone.

When you say incompatible do you mean like I'm trying to use iPhone 3G batteries in my 3GS?

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Tam BM will be eternally grateful.
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