These 7.4 volt 2 cell 5000mAh Lipoly Hard Case Pack are all hand assembled in house. We use only the best materials and supplies for our assembly. At 5000mAh and 30C rating these packs are a winner. Able to handle 150 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 balancing connector.