The Antigravity Batteries ATX20 is a Lithium-Ion replacement battery for the OEM Lead/Acid Battery often called the YTX20, YTX20L, YTX20H, YTX20-BS or the 20 Size. But the difference is that the Antigravity Batteries Lithium-Ion version weighs less than 5 lbs and amazingly offers OVER 2.5 times the Cranking Power of the Lead/Acid version. The new ATX20 battery can also be used in Hi-Performance Automotive and Racing applications where extremely high cranking power and massive weight reduction in a very compact size are desired. At a massive 780 Cranking Amps in an extremely compact size, this battery offers the most power in the smallest package you can find for your vehicle.