These 7.4 volt 2 cell 4400mAh Lipoly Hard Case Pack are all hand assembled in house. We use only the best materials and supplies for our assembly. At 4400Mah and 15C rating these packs are a winner. Able to handle 66 amp max discharge currents. These are perfect for your Traxxas Slash, Traxxas Emaxx, or Traxxas E Revo. These packs are hard case protected and have built in flush mounted balancing connector.