Released on September 19, 2014, this 5.5" screen iPhone is the larger version of the iPhone 6.

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Do I have a defective replacement battery?

My replacement battery is showing an 8% capacity loss after 1 charge cycle. I find that pretty %#*@ steep but I know nothing about batteries besides checking the capacity and cycle count.

The charger I'm using is still the same one I got with the phone.

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Depends on where you got the battery replaced from. If I were you I'd keep using it and if it drops way too fast then I would go for warranty on the battery.

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Run a few cycles first to see if the capacity stabilizes.

Battery capacity is subject to manufacture tolerances, temperature, measurement inaccuracies and a lot of other factors, a few percent is totally normal.

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