The official Power Bank from OnePlus, which boasts 10,000mAh of juice for just $15, is to go on sale next week following its unveiling last December. You'll be able to get yours from the OnePlus online store in colors that match your One smartphone.

"Ready… Charge!" reads the teaser image OnePlus tweeted out on Friday, confirming the Power Bank's March 17 launch date. The device is expected to be available in all of the markets OnePlus currently serves — including the U.S. and Europe.

The Power Bank comes in Silk White and Sandstone Black — just like the One — and it packs a 10,000mAh battery capacity that delivers approximately 5.5 hours of charge time. It also offers dual USB 5V/2A outputs; built-in protection from overcharging, overheating, and short circuits; and four LEDs that indicate how much battery life is remaining.

"Featuring world-class lithium-polymer technology, our Power Bank is surprisingly lightweight and easy to tote," OnePlus boasts. "At the airport or in the great outdoors, never again worry about straying too far from an electrical outlet."

OnePlus also highlights the device's "sleek lines, gentle curves, and an emphasis on minimalism," which make the Power Bank prettier than a lot of external battery packs.

At just $15, the Power Bank could be the ideal partner for your OnePlus One — or any other smartphone or tablet, for that matter — if you find you're frequently running out of battery before the end of the day.