Antigravity ATX20-HD Lithium Battery (High-Capacity, High-Cranking Model)
The Antigravity ATX20-HD is a high-output, high-capacity lithium battery compatible with the standard YTX20 size. Compared to other lithium batteries in its class, it offers superior cranking performance and actual capacity, making it ideal for touring motorcycles, vehicles equipped with many electrical accessories, and large-displacement engines.
While this model does not feature the RE-START function, its large capacity and discharge-resistant specifications allow for stable power supply during prolonged use or in vehicles with numerous electrical accessories. Furthermore, it is equipped with a full BMS (over-discharge / over-charge / over-heat / cell balancing protection) to maximize safety and service life.
Specifications
Case Size (YTX20 compatible): Approx. 17.5 × 8.6 × 13.0 cm (L × W × H)
Cranking Amps: 780 CCA
Capacity (Lead-Acid Equivalent): 30Ah
Actual Capacity (LiFePO4): 15Ah (192Wh)
Weight: Approx. 2.35kg (5.18 lbs)
Management System: Full BMS included
Status Check: Voltage indicator on top surface
Mounting Orientation: Can be mounted in any orientation
Application: Motorcycles / Powersports (not intended for automotive use)
Features
High cranking performance allows for reliable engine starts even with large-displacement and high-compression engines. It has a higher actual capacity than common lithium batteries of the same size, keeping voltage stable even when using electrical accessories.
The voltage indicator on the top of the battery allows you to check the charge level while it is still installed in the vehicle. The full BMS function keeps the battery in a safe state at all times and ensures a long service life.
It provides a weight reduction of up to 70% compared to standard lead-acid batteries, improving vehicle handling performance.
The 4-terminal design provides flexibility for wiring layouts and positive/negative orientation.
Recommended Applications
Street bikes up to 1700cc class
Touring motorcycles with multiple electrical accessories (e.g., heated grips, power ports, GPS, ETC)
Vehicles with large-displacement, high-torque engines
Racing/track vehicles where weight reduction is prioritized
(*Not compatible with personal watercraft)
Regarding V-Twin / High-Power Engines
For models with 135ci (approx. 2210cc) or larger, high-compression, or camshaft-modified engines, the ATX30-HD / YTX20 / YTX12-24 / V-10 are recommended.
Compatible Standard Battery Models
YTX15 / YTX15L / YTX15L-BS
YTX20 / YTX20-BS / YTX20L / YTX20L-BS
YTX20H / YTX20H-BS
YTX20HL / YTX20HL-BS
YIX20HL
If you are unsure of compatibility, please contact us with your vehicle model, year, and standard battery part number.
Included Items
Lithium battery unit
Terminal bolts for installation
Instruction manual
Warranty
3-year manufacturer warranty
Before Ordering
〇 About Import Duties
At the Shaftoya shopping site, we cover the import consumption tax incurred at the time of import on our end, so there are no additional charges beyond the total amount paid at checkout.
〇 Confirmation of Compatibility
Our entire product database is based on North American market vehicles (USDM). Please confirm whether the product can be installed on Japanese market vehicles (JDM) before ordering. (If you are unsure if the listed product is compatible with your vehicle, please feel free to contact us. Our support team will investigate for you.)
If you place an order without confirming compatibility, we cannot accept returns due to incompatibility.
Please note that even if items are sorted by selecting the year, manufacturer, and vehicle model in the tabs on our top page, this does not guarantee direct fitment for Japanese models without modification.
All products have been translated into Japanese using translation software. As there may be confusing expressions, please contact us before ordering if you have any questions.
○ Regarding Shipping
Shipping costs are paid at the time of checkout. Estimates for shipping can be calculated automatically by entering your shipping address on the checkout page. For large items such as body parts, the actual shipping cost may occasionally differ significantly from the automated calculation. In such cases, we will contact you individually via email.
In principle, all products are shipped internationally from our U.S. warehouse. Unlike domestic shipping in Japan, international shipping takes approximately 7 to 14 days, so please allow yourself enough time when ordering. 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
Essentially, all products handled by our company are designed and manufactured outside of Japan. Please understand that they are not compliant with the "Japanese Vehicle Inspection System," and we cannot provide strength calculation documents or similar paperwork for these systems. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off-road," and installation and use are at your own risk.
○ Regarding Warranty
Please inspect the contents immediately upon arrival. As all products are shipped internationally from outside Japan, there may be instances of damage to shipping boxes or products. Please understand that we will only provide returns, refunds, or replacement exchanges for damaged items, defective products, or incorrect items if notified within 7 days of receipt. Furthermore, for products sold through our company, all warranty-related support will be handled "exclusively through our company." Please note that we do not provide support through other companies or distributors located within Japan.