Meritline offers the Dual-USB Output 5,000mAh Rechargeable External Battery in Black for $23.99. With free shipping, that's tied with our November mention and the lowest total price we could find for this battery in any color by $3. It functions as an emergency backup power source for cell phones, tablets, and other devices. It includes adapters for Sony Ericsson, Apple, Nokia, Motorola, LG, Samsung, HTC, and more.

Expect this item to take two to three weeks to arrive.