Infapower’s 4 Channel USB Charger has the following features.

Charges 1, 2, 3 or 4 batteries at a time  
Charges any brand of rechargeable batteries  
Charges using Micro USB cable (included)  
LEDs show which batteries are being charged  
Worldwide use with USB plug (not included)  
Includes 4 AA 1300nAh batteries  
Short circuit protection  
Compact and light  
Reverse polarity and bad cell detection  

4 Channel USB Charger
with Batteries

Hover over image for Inner and Outer quantities.

Inner 6 / Outer 36