High quality 11.1 V Li-Ion rechargeable battery pack Made ofNine 2200mAh 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 11.1V/8.8Ah two PCB ready battery modules in parallel Built-in IC chip will prevent battery pack fromover charge and over discharge and prolongs battery life Ideal for replacing batteries for 12V HID (10 to 13W) and Diving Lights for long running time Perfect for for RC toy, lighting, robots,and DVD external battery.Use the Smart Universal Li-ion Battery charger for proper chargingTechnical SpecificationsCapacity6600mAhVoltage10.8V (Peak at 12.6V, avg. at 11.1V)Dimensions69mm height x 54mm width x 54mm thicknessWeight15.2ozMax. charge current2Max. discharge current6.5ACut off voltageover-charge protection13Vover-Discharge protection7.2VCautions CAUTIONwhen working with Li-ion cells, they are very sensitive to charging characteristics and may explode if mis-handled. User should have 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 suggestthat youuse 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 BatteryPlease don't make parallel connection with more thanthree modules to avoid uneven charge.