The Antigravity ATX20 RE-START Lithium Battery is an ultra-lightweight, high-cranking lithium battery designed to replace stock YTX20 size lead-acid batteries. Its most notable feature is the RE-START function, which automatically enters a protection mode when the battery level gets low, reserving enough power to restart your vehicle. If the battery happens to die, you can simply press the button on top of the unit to jump-start the engine, allowing you to get back on the road even in the event of an unexpected power failure.
Weighing only about 1.7 kg, it is significantly lighter than conventional lead-acid batteries. Despite its low weight, it offers a high cranking output of 680 Cranking Amps, making it perfect for touring bikes, large-displacement V-twins, custom builds, and race vehicles.
It features an internal Full BMS (Battery Management System), which protects against over-discharge, over-charge, and overheating, while providing cell balancing to improve safety, longevity, and stability. Additionally, the 4-terminal design provides flexible mounting options, making it easy to install on a wide range of vehicles.
Dimensions
Approx. 17.5 × 8.6 × 13.0 cm (Length × Width × Height)
Specifications
Cranking Amps: 680 Cranking Amps
Capacity: 20Ah (Lead/Acid Equivalent) / 10Ah Actual / 128Wh
Weight: Approx. 1.7 kg
Mounting Orientation: Can be mounted in any orientation (no leaks)
Part Number: AG-ATX20-RS
Compatible Stock Batteries
YTX15 / YTX15L / YTX15L-BS
YTX20 / YTX20-BS / YTX20L / YTX20L-BS
YTX20H / YTX20H-BS / YTX20HL / YTX20HL-BS
YIX20HL
GYZ20H / GYZ20L / GYZ20HL
Recommended Applications
Large motorcycles up to 2200cc
Harley-Davidson Touring models
Large-displacement V-twins and high-power engines
Adventure / Touring
Custom/race vehicles where weight reduction is prioritized
Note
Not generally recommended for automotive use.
Use in "four-wheeled race vehicles" may be possible; please contact us in advance.
For vehicles with older regulators, we recommend checking or replacing the regulator to prevent overvoltage.
Before Placing an Order
〇 About Import Consumption Tax
At Shaft-ya, we cover the import consumption tax incurred at the time of import, so you will not be charged any additional fees beyond the total amount paid at checkout.
〇 Confirming Compatibility
Our product database is primarily based on North American (USDM) vehicles. Please verify compatibility with Japanese (JDM) vehicle models before ordering. (If you are unsure whether a listed product is compatible with your vehicle, please feel free to contact us. Our support team will be happy to look into it for you.)
We cannot accept returns due to incompatibility if an order is placed without prior verification.
Please note that even if products are sorted by selecting the year, manufacturer, and model using the tabs on our top page, it does not guarantee that they will fit a Japanese model vehicle without modification.
All products have been translated into Japanese using translation software. If there are any confusing expressions, please contact us before placing your order.
○ Regarding Delivery
Shipping fees are paid at the time of settlement. An estimate of the shipping cost will be automatically calculated when you enter your shipping address on the checkout page. In rare cases, there may be a significant difference between the automatically calculated shipping cost and the actual cost for large items such as body parts. In such cases, we will contact you individually via email.
All products are generally shipped internationally from our warehouse in the U.S. Unlike domestic shipping in Japan, international shipping takes approximately 7 to 14 days, so please allow ample time for delivery. If you are in a hurry, please contact us for a delivery estimate in advance. Note that all products are transported by air. They are not shipped by sea.
○ Regarding Japanese Vehicle Inspection (Shaken) Compatibility
Please note that all products we handle are designed and manufactured outside of Japan. They are not compliant with Japanese vehicle inspection standards ("Shaken"), and we are unable to provide strength calculation documents or similar paperwork for these standards. Consequently, all parts are sold for use on circuits, private property, or off-road, and any installation or usage is done at the customer's own risk.
○ Regarding Warranty
Please inspect your items immediately upon arrival. As all products are shipped internationally, there is a possibility of damage to the packaging or the product during transit. We will only accept returns, provide refunds, or send replacements for damaged items, defective products, or incorrect orders if notified within 7 days of receipt. Please understand that all warranty-related issues for products sold through our store must be handled exclusively through us. We do not provide support through other companies or distributors within Japan.