For less than $20, this battery backup is a no-brainer

Smartphones are great. They keep us connected and entertained everywhere we go—at least, as long as they have a full battery. Unfortunately, while smartphones have improved by leaps and bounds, batteries haven't.

Luckily, there's an easy solution: a USB battery backup. These power banks usually store enough juice to charge your phone or tablet several times over and work anywhere. And you can pick one up for less than $20 today with the Anker PowerCore 10000 ($18.69 at Amazon).

Anker is one of the most popular purveyors of mobile accessories, and the PowerCore 10000 offers a fantastic mix of portability and capacity. Its 10,000mAh capacity is enough to charge most smartphones three times over and it is about as big as a deck of playing cards. I have a similar backup and I've used it for plenty of other devices, too, including USB-powered lights, cameras, and even a small fan at the beach.

This model doesn't have all the features of the more expensive battery backups (like the ability to charge two devices at once or use Qualcomm's Quick Charge feature), but it gets the job done at a rock bottom price.

If you do want to step up to a backup that has those features, you could look at something like this Aukey 16,000 mAh battery backup which supports Qualcomm Quick Charge 3.0 and features dual USB outputs for $42.99.

Buy now at Amazon: Anker PowerCore 10000 ($18.69)

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