Power banks with built-in USB-C cables are convenient, so its no surprise that theyve become popular. Theyre particularly great for the forgetful among us, who might remember to pack away a power bank for a trip, but not the necessary cable to charge your gadgets. If you want to get one of the smallest, most affordable options with a built-in cable-meets-lanyard, head over to Amazon where you can get Ankers Zolo 10,000 mAh battery for just $12.94. Youll be able to get that price at checkout when you click the on-page coupon to save an additional 17% off the listed discount.I recently included this model in an update to Polygons roundup of the best power banks. At 30 W, its not going to be powerful enough to quickly charge the Steam Deck or other powerful handheld PCs. However, it can charge most phones at full speed up to two times before needing a recharge. The Nintendo Switch is also a good candidate to be paired with this battery, as its max charging speed is 18 W. Of course, you can plug this battery into any rechargeable device that has a USB-C port. It just may not fill it as quickly, or as fully, as you might hope.Anker makes a 20,000 mAh version with more juice (at the same 30 W speed), in case you have a little more room in your bag for a power bank. Its $27.35, which is 24% off its original price.