-High quality 3.7 V Li-Ion rechargeable battery pack
-Made of 2 2600mAh cylindrical 18650 cells with PCB and poly switch for full protection
-Light weight and higher energy density than any rechargeable battery
-No memory effect and rechargeable
-Longer storage life than NiMH battery
-You can build 7.4V/5.2Ah Li-Ion battery pack by connecting two or three PCB ready battery module in parallel .
-Built-in IC chip will prevent battery pack from over charge and over discharge and prolongs battery life
-Perfect for building 3.7V battery pack for bike lighting, RC toy (cars and airplanes), robots, cameras, DVD external battery.