Qumi Battery Pack
The Qumi battery pack is a portable, rechargeable lithium-ion battery that can charge multiple devices through a USB port and delivers 1.8 to 4.5 hours of use (lumens vary). With the new Qumi battery the Qumi becomes even more portable to share, work and entertain. You can have up to 4.5 hours of use at 50 lumens for Q4 and Q5