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Testing shows an almost 30 percent increase in battery life! See PhoneBuff's full test https://www.youtube.com/watch?v=qbxdHpD5jWw Read our full story on Engadget: https://www.engadget.com/2019/10/21/dark-mode-ios-13-test/ Get More Engadget: • Like us on Facebook: http://www.facebook.com/engadget • Follow us on Twitter: http://www.twitter.com/engadget • Follow us on Instagram: http://www.instagram.com/engadget • Read more: http://www.engadget.com