Battery Packs Lithium Ion Polymer Battery 3.7V 1200mAh (1 piece) This battery is for general use. Please make sure this battery will fit your application by measuring against the dimensions below. The batteries come pre-attached with a genuine 2-pin JST-PH connector as shown and include the necessary protection circuitry. Because they have a genuine JST connector, not a knock-off, the cable wont snag or get stuck in a matching JST jack, they click in and out smoothly.