Battery connector: MX2.0 Plug, or called molex plug, Battery dimensions:29*19.7*7.7mm/1.14*0.78*0.3 inch Battery weight: 7.4grams/0.26oz. Discharge rate:25C. material:Lithium-polymer.
Charger SPEC: Input: 5V 2A (USB interface), Output:4.2V 500mA*4. 4 charge port, it can charge 4 batteries at same time . Charge manual: red indicator is solid when charging, red indicator is off after full charged.
3.7V 250mAH Lithium-polymer battery spare parts for some Small RC helicopter RC Quadcopter Drone, which size, vlotlage and plug all match.
3.7V 1S 250mAh Battery suitable for Some small Remote control sharks RC Car toys. which size ,voltage, and plug fit.