ATX20R OEM Case Battery

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NEW! ATX20 Lithium-Ion Battery

The NEW 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! So those difficult starting large Custom V-Twin Motors can be turned over with ease.

The OEM standardized size of the ATX20 is used in a many different manufacturers models of Motorcycles including Harley Davidson’s, Victory, Metric Cruisers/Tourer’s as well as many Powersport Vehicles such as UTVs/ATVs, Snowmobiles and more.

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. As with all our batteries, you can easily bolt on our Automotive Terminal Adapters for use in high performance automotive applications.

To give you an idea of the power of this battery, the ATX20 can easily start 145 Cubic Inch S&S V-Twin Motors, and just as easily start an 800 Horsepower V8 Roush Racing Motor typically found in Trophy Trucks or NASCAR Sprint Cars, yet the ATX20 weighs LESS than 5 pounds! 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.


Please note

You MUST only charge our lithium batteries with a lithium specific battery charger, (such as the Optimate battery chargers offered on this website) the use of any other type of battery charger is likely to damage the battery and invalidate the guarantee.




Ultra-Lightweight and Highest Power Lithium Motorsport Battery made in this size format.

Super Compact Lithium-Ion Battery Design.

Can offer weight savings of up to 32 pounds in race cars and 14 pounds in Motorcycles.

Can hold a charge OVER a year provided there are no “Parasitic Drains” (accessories that draw power when the vehicle is off, such as alarms, ECU’s, iPods, GPS, heated grips, etc).

Built in the USA to the highest quality standards with sturdy, big, all-brass terminal design.

All Antigravity Batteries are designed to allow for BOLT-ON SAE Automotive Battery Terminals for use with Performance Autos.

3-Year Pro-Rated Warranty


Technical Details


780 Cranking Amps – Cranking Amps are the power the battery has.

20 Ah (PbEq) Amp Hours are the Capacity of a battery.


Dimensions and Weight


USA SIZE: (LxWxH): 6-7/8″ x 3-7/16″ x 6-1/8″ (Height is measured to the top of the battery case).

USA WEIGHT: 4 lbs 11 ounces

METRIC SIZE:  (LxWxH): 175mm x 87mm x 155mm (Height is measured to the top of the battery case).



Get in Touch

Whilst you can find answers to our most frequently asked questions on our FAQ page, we know there are times when it’s simply best to talk. So whether you’re looking for expert technical support to help install a product, have a specific application that you need a product for or just need advice on anything and everything to do with performance starting and charging solutions, then please feel free to contact us directly using the form. One of our team will be sure to get back to you just as soon as we can.