Monoprice offers its Monoprice 5,200mAh 2.1-amp Battery Pack in Black, model no. 13794, or Pink, model no. 13795, bundled with 4" and 3-foot MFi-Certified Lightning to USB Cables for $9.99 with free shipping. That's the lowest total price we could find for the battery pack alone by $21. It features an LED flashlight and includes a zippered storage case and microUSB cable.

Also available is the Monoprice 9,000mAh 2.1-amp Battery Pack in Black, model no. 13796, bundled with 4" and 3-foot MFi-Certified Lightning to USB Cables for $14.99 with free shipping. That's the lowest total price we could find for the battery pack alone by $27. It includes a zippered storage case and microUSB cable.