Discontinued Product. Wren Speed Control Capacitor 5002030 Power battery box with strap, has 12V outlet, battery condition and carry handle. Product Description Features: Circuit Breaker, 10amp External Terminals, useful for charging the battery also includes solid brass terminal posts. Carrying Handle, designed for easy carrying. Adjustable strap for use when carrying or securing battery box in a fixed position. Made from impact resistant polypropylene. Specifications Internal size(mm): 325L x 185W x 185H