This battery has extended the life of my iphone. ...

This battery has extended the life of my iphone. I was at the point where my phone had to basically live on a charger. However, I do not believe it holds a charge as long as the original factory battery did when it was new. Also, this battery seems to get HOT when the phone is in use. If I play an app on my phone for a while and place the phone in my pocket (there is no protective case on my phone) afterwards, I can feel the heat on my leg. It's borderline between very warm and mildly hot.

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