What do you do when your phone is running low on battery and you must make a phone call because the wife expects you to do some grocery shopping before you get home or because your tummy has started rumbling and your only path to salvation is through the gooey cheese-stuffed crusts of a pepperoni pizza?

Well, you either whip out your speed rapping skills that you innately acquired that very moment to blast through an entire conversation in a few seconds, or you wish you were using an ASUS Zenfone Max with its 5000mAh battery to never, ever, have that problem in the first place.

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