This is a lightweight Lithium Ion polymer battery, with a high energy density. It has a nominal output of 3.7v at 1200mAh and it enclosed with a standard 2-pin JST connector (with 2.0mm distance between the pins)
Measurements: 5x35x62 mm (thickness*width*length)
Note: Do not charge the 2U Lithium Ion Polymer 1.2 Ah battery with anything besides the specialized lithium polymer charger. The Battery includes a built-in protection against over voltage, over current and minimum voltage.