Abstract: An improved electrical connection system for use with corrosive high capacity batteries. Conductor cables are securely cast within the battery into battery terminals to provide a direct and permanent electrical connection between the terminals and the cables. Cable insulation covers the conductor cables at all points above the terminal-cable connection. All connections are secured by using the methods of casting, welding, potting or crimping. Seals made from a nonconducting material extend the exterior of the battery over all electrical connections and further enhance the mechanical integrity of the electrical connections, as well as providing for chemical and electrical isolation of the electrical connections. Thus, the electrical connection system described herein avoids leakage of electrolyte onto the surface of the battery, eliminates frequent repair and maintenance, provides for full voltage delivery, and improves safety.