Features and Benefits High quality 7.2 V Li-Ion rechargeable battery pack Made of 2 2000mAh 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 7.2V/4.0Ah 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 7.2V battery pack for bike lighting, RC toy (cars and airplanes), robots, cameras, DVD external battery. Technical Specs Capacity 2000mAh Voltage 7.2V Dimensions 1.4 x 0.6 x 2.5 inch Weight 6.0 oz Max. charge current 1C (2.0A) Max. discharge current 2.5C (5A) Cut off voltage 6V Cautions Use special caution when working with Li-ion cells, they are very sensitive to charging characteristics and may explode if mis-handled. Make sure user has enough knowledge on Li-Ion rechargeable batteries in charging, discharging and assembly before use. We are not responsible for any damage caused by misuse or mishandling of these Li-Ion batteries Strongly suggest that you use our smart Li-Ion battery charger to recharge the battery pack Never use conventional DC adapter to charge the battery module) We are NOT responsible for any damage that is caused by the misuse of the Li-Ion Battery Please don't make parallel connection with more than two modules to avoid uneven charge.