This is SM-2P black 2 pin plug, if you need another kind plug battery,please choose another battery ASIN: B09Q3CCBFY instead. this battery real capacity about 600mAh.SM-2P black 2 pin connector plug,plug end cross-section size:5.6*4.9mm/0.22*0.19in. Red cable is positive, black cable is negative, please make sure your device plug positive polar in same line. or else will cause short circuit. Discharge plug SM-2P black 2 pin connector, Battery weight 37grams/1.31oz, Lithium battery capacity 600mAh , Voltage:7.4V 2S, Discharge rate: 15C. 2S 600mAh Li-ion rechargeable battery fit.