2 different battery life readings?

Im alittle confused here. im getting 2 different battery life readings.
For instance, on the iphone(small battery on the top right of the screen) it shows
around 40% charge left. When i connect it to my pc the big green bar shows up. but it shows that i have over 50% charge left. Why is this?

The bar in the top right corner of the screen is just used mainly as an idea of how much is left. The green bar is larger, therefore can have more detail, so it can so a more accurate reading.
HTH,
Jenna

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