7.4V 1000mAh Li-ion Rechargeable Battery, Plug:SM-4P, plug end cross-section size: 10.6*5mm /0.42*0.2inch. 2 black plug cable is negative polar, 2 red cable is positive polar, make sure postive are in same line cable with your device. Battery dimensions: 52*56.6*15 mm/ 2.05*2.23*0.58 inch, Battery weight: 73grams / 2.56oz, 7.4V 1000mAh Rechargeable Li-ion battery suitable for LARVEY 2WD 1:16 Scale Remote Control Car,.