How Does Apple Test iPhone Battery?

My iPhone 4s is does not seem to be holding the same charge as it did a year ago. I have apple care plus and called support. They set up an appointment with me to bring it into the store. Can they actually test the battery? I don't want to spend an hour driving round trip and two hours in the store only to be told there's nothing they can do or that my battery is fine for a one year old phone.

It won't hold the same charge and you shouldn't expect it too, batteries have a shelf life.

Batteries loose capacity as they age and are charged each time. They won't hold the charge as long over time. They will probably hook it up to a battery tester and unless it's nearly dead, they will tell you it's fine. If you can charge it overnight and it holds all day, that would be considered normal.

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