This is a light weight, high energy density Lithium Ion polymer battery. It outputs a nominal 3.7v at 2000mAh, comes terminated with a standard 2-pin JST connector- 2.0 mm spacing between pins. Features Excellent long-term self-discharge rates Dimensions: 68x48x5.7mm Weight: 43g ± 5g Specification Please do not attempt to charge these with anything but a specialized Lithium Polymer charger. Battery includes built-in protection against over voltage, over current, and minimum voltage.