Aukey’s accessory lineup is wide-ranging, with items like charging cables, wall adapters, and battery packs. The company’s packs have performed just okay in the past, with overall efficiency failing to crack the top half of all the portable battery packs we’ve tested.

That changes with the 10,000mAh (37Wh) Basix Slim battery pack from Aukey. This $19.99 pack punches above its price in performance, although the overall build quality leaves us somewhat disappointed.

Note: This review is part of our roundup of portable power banks. Go there for details on competing products and our testing methods.

As its name implies, the Basix Slim is rather, well, basic and slim. It’s small enough to fit into a side or front pocket on your favorite backpack, or even your pants pocket if you’re in a bind. There are four total ports on it, three of which are in the front of the pack. There are two full-size USB ports, with a USB-C port in the middle. On the right side of the housing is a microUSB port (more on that in a minute). On the left side you’ll find the power button—well, really more of a status button, as you don’t need to press it in order to start charging a device. Just plug something in and the pack automatically wakes up and starts charging. 

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