"Power Crank EXTREE Series Batteries offer a maintenance free design with superior performance. Engineered for Australian conditions, it is the perfect battery for your vehicle. Key Product Features * Calcium-calcium tin and silver maintence-free battery *Expanded metal grid Technology *Centered cast-on-strap cells *Double chamber container with condensation mechanism * builtin magic eye and flame arrestor * best grade virgin lead, pp and chemicals * Robust design to perform in all terain conditions"