Fifth generation of iPhone. Repair of this device is straightforward, and requires screwdrivers, prying tools, and patience. GSM/CDMA / 16, 32, or 64 GB / Black or White.

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New battery in but shut down after 2 to 3 min?

Put in 2 different iPhone 4s new but after 2 or 3 min, it would shut off, had signal 4g & wifi but keeps turning off. Had to put old battery back in & works but battery life is not long that's why I got a new one but not working out what is going wrong?

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Reed, if "Had to put old battery back in & works " talk to the vendor you purchased the "new" battery from and exchange it. Even "new" batteries may be faulty and/or discharged below the charging threshold.

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When you buy a new lithium-ion battery they are usually only charged to about 40% and if it has sat on the sellers shelf for awhile it may have discharged even more. Did you try giving the new battery a good charge? If this type of battery sits to long and discharges to a voltage below 2.9v it has a protective circuit that will put the battery in sleep mode, and the battery has to be boosted to wake from the sleep mode. I would have guessed this was the problem but it sounds like the battery was able to run the phone for a couple minutes before shutting off. Most Li-ion batteries may power on a phone at 3.4v but it will shut off within a minute or two because that is not enough voltage to run the phone. Below 3.3v the phones battery would appear to be dead until charged. The nominal voltage of 3.7v-3.85v is what most Li-ion are rated to run at and charge to 4.2v-4.35v at a full charge. If it falls below the nominal voltage it may power up but probably won't stay on long.

So what I am getting at is if the battery is not holding a charge of around 3.7v and is dropping to 3.4v or lower then the phone would show symptoms like what you have described. This could indicate a battery that has had a long shelf life in a hot or cold environment, or its possible you where sold a battery that has been used and was sold as new, or is just faulty. If you have access to a multimeter and can test the batteries voltage that would tell you if the batteries voltage is in the right range. If you can exchange this new battery for another one I would try that first.

If not then maybe try doing a soft reset and if that don't work try the hard reset.

Hope you get it figured out.

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