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https://macdailynews.com/2015/10/08/apple-claims-iphone-6splus-a9-battery-performance-only-varies-2-3-between-tsmc-and-samsung-variants-in-real-world-usage/
Apple claims iPhone 6s/Plus' A9 battery performance only varies 2-3% between TSMC and Samsung variants in 'real-world usage'