When listing a phone’s specifications, we don’t usually start with the battery, but we’ll make an exception in the case of Asus’s new ZenFone Max. The 5.5-inch smartphone has an enormous 5,000 milliamp-hour (mAh) battery — a huge capacity compared with the likes of the Samsung Galaxy S6, which comes with a 2,550 mAh battery, or the iPhone 6 Plus, which has a 2,915 mAh battery.

Even better, you can use the ZenFone Max, which was launched during an Asus event in India on Thursday, as a spare battery to charge other devices.

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