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원문 게시자: Dan ,

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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: [http://batteryuniversity.com/learn/article/charging_lithium_ion_batteries|Charging Lithium-ion]. As you can see its a bit of work. Here's a sample circuit: [http://homemadecircuitsandschematics.blogspot.com/2012/05/make-this-li-ion-battery-charger.html|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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