Racers Edge 40C 5000mAh 14.8volt 4S1P LI-Poly Battery with Deans plug.This hardcase 4s lipo battery offers superior voltage and long runtimes.  The dimensions are 48mm wide, 138mm long, and 48mm tall. This battery is a great option for 1/8th scale electric buggies, or electric monster trucks with plenty of voltage and a great 40C power rating. It uses the same balancing connection as Align or Electrifly chargers. Be sure to use a voltage cut off if your speed control doesn't come equipped with one. ONLY USE A CHARGER SPECIFICALLY FOR Li-Poly cells!!!