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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Overcharge protection. Function of battery or phone?

I need to charge my battery externally. My only concern is overcharging and ruining the battery. I know there is a circuit somewhere that prevents overcharging. Is that circuit built into the battery, or is it part of the phones hardware?

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Its in both!

The sensors are within the battery and the controlling logic is within the phone. Li-Ion batteries need to be charged with a special charger you can't just plug any power source to the battery.

Here's a basic writeup on what needs to be done: Charging Lithium-ion. As you can see its a bit of work. Here's a sample circuit: Make this Li-Ion Battery Charger Circuit. The only problem here is you would need to dig a bit deeper to find out if this would work for a iPhone 4s battery, I'm not sure it would.

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