All the advanced features in a smartphone would be pointless if your mobile device doesn’t survive long enough for you to plug it in at the end of the day. In lieu of the long-dead practice of replaceable batteries, OEMs are now being asked, often demanded to put larger batteries into smartphones that are growing larger every year anyway. Naturally, that’s going to be a point of contest between this year’s two bitter rivals, the Apple iPhone XS Max and the Samsung Galaxy Note 9. You might already know the winner but how it gets there is still surprising.

If pure numbers are to be considered, you’d be correct to assume that the Galaxy Note 9 would last longer than Apple’s largest iPhone to date. After all, it has a 4,000 mAh battery compared to the iPhone XS Max’s 3,174 mAh. That’s a huge advantage if you’re just taking mAh figures into account.
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https://www.slashgear.com/galaxy-note-9-iphone-xs-max-battery-test-isnt-what-you-expect-14549910/