The ALL NEW Antigravity ATZ-10-HD is our new Heavy Duty, High Capacity version of our popular ATZ-10 RS Battery. It is built with our groundbreaking RE-START Technology (built-in jump-starting), but offers a full 50% larger (9Ah) Lithium Battery inside compared to our standard ATZ-10 (6.1Ah). The new ATZ-10-HD boasts the largest Lithium Battery compared to any similar size battery on the market. It replaces the very popular OEM Lead/Acid size known as the "YTZ10S" which is found in many ADV (Adventure) Bikes, Sport Bikes, and other bikes and ATVs.