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Repair information, troubleshooting tips, and guides for the sixth iteration of Apple iPhone, announced on September 12, 2012. Model: A1428, A1429

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What voltage should be supplied to the battery when charging?

I have an iPhone 5 that won't turn on, and I'm trying to figure out why. It won't turn on with or without the battery connected.

When I run a multimeter over the connections to the battery on the logic board whilst charging, it varies between 1.2v and 1.3v. That's pretty low, and even after charging overnight (approx. 8 hrs) the battery did not hold a charge so I'm planning on replacing the dock connector and battery. Before I do that I just wanted to check, what should be the expected voltage being supplied to the battery?

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The lithium battery in the phone has a nominal voltage of 3.7 v. But that's an average. Depending on the % charge, the voltage can be between 3.2volts ( low charge) to 4.2 volts ( full charge). So I agree, your measurement of 1.2 v is very low.

I'd say you need a new battery, as you planned.

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