The NEW Antigravity ATX20-HD battery is a High Power, lightweight lithium replacement for the popular YTX-20 size Lead/Acid battery. This is the HEAVY DUTY version, designed with significant Power and Amp-Hour Capacity in this popular case size. This battery is suitable as a much lighter replacement for a regular size lead acid battery. It only weighs 5.18 lbs! The 20amp hour capacity is more suited for drag racing cars that don't need higher capacity like daily driver cars. If the car is a daily or has a really demanding electrical system we recommend the ATX30-HD instead.We can only ship this product by GROUND with UPS or FedEx in the lower 48 US States!Need a different size we don't have listed? Let us know and we'll add it to the website ASAP!