How to check if your iPhone 6s has a TSMC or Samsung A9 chip

Battery life is probably one of the most important factors while buying a smartphone. So it is not surprising that the difference in battery life between Samsung and TSMC’s A9 chip is getting so much attention.
Apple has also acknowledged that there is indeed a difference between TSMC and Samsung’s A9 chip, though it insists that the variation is minimal.
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