IPhone 4S wall charger specifications?

My iPhone 4S battery is acting weird lately. I tried various settings, tried restore, but still usage time isn't so good (up to 5h). So I wanted to measure capacity of battery somehow. Since there is no some software for that, I think of something. I wanted to find out somehow, how much mAh is iPhone 4S wall charger, so that I could measure the exact time of charging from 0-100% and than calculate how much capacity is my battery. But I don't know how to find out hom much mAh does apple wall charger produce? Can someone realize this from this picture, or can tell me some official information?

All of the information is right there. Output: 5 V, 1A. If you can't figure it out from that you probably can't do the rest of the calculation either.
1A = 1,000 ma
So if you charge for 1 hour the charger will put out 1 hr x 1,000 ma = 1,000 mah.
If you charge for 2 hours the charger will supply 2 hr x 1,000 ma = 2,000 mah.
But I'm not sure how that helps you, because the charging circuit in the iPhone is less that 100% efficient. The battery in the 4S has a capacity of 1430 mah. As the charger supplies 1,000 ma, it should take 1.430 hours or 1 hour 28 minutes to charge if the charger was 100% efficient. Suppose it takes 2 hours. What does that tell you?

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IPhone 4S wall charger specifications?

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