Century Australian Made Maintenance Free N70 Overlander Century Overlander 4x4 batteries are designed to handle it all from touring 4x4s which stay on sealed roads, all the way through to purpose-built weekend off-road warriors. Designed & built in Australia to withstand the punishment of our extreme climate & harsh off-road conditions, Centurys Overlander 4x4 is a dual-purpose battery providing superior starting power & semi-cycling capabilities to power aftermarket vehicle accessories.