This is a light weight, high energy density Lithium Ion polymer battery. Each cell outputs a nominal 3.7v at 1050mAh. This solid 3 cell pack (3Ahr) comes terminated with a standard 2-pin JST connector- 2.0 mm spacing between pins. Features: Excellent long-term self-discharge rates Dimensions: 16.1x38.8x47.5mm Weight: 60g 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.