Antigravity Batteries AG-401 Lithium Battery (Ultra-Compact/Ultra-Lightweight Model)
The Antigravity AG-401 is the most compact and lightweight lithium motorsport battery in the Antigravity battery lineup.
It is the ideal model for race vehicles where extreme weight reduction and limited battery space are factors, achieving a class-leading light weight of only approximately 430g (15.2oz).
Specifications
Case Size: Approx. 11.1 × 3.5 × 9.5 cm (Length × Width × Height)
Cranking Amps: 120 CCA
Capacity (Lead-acid equivalent): Equivalent to 6Ah
Actual Capacity (LiFePO4): 2.6Ah (33Wh)
Weight: Approx. 0.43kg
Chemical Composition: LiFePO4
Terminals: Brass Terminals
Included Accessories: Adhesive foam spacers
Features
Extremely compact, suitable for vehicles with restricted installation space, race vehicles, and custom builds.
At approximately 0.43kg, it is exceptionally lightweight, contributing significantly to improved vehicle handling performance.
Features a 120 cranking amp starting power, sufficient for starting engines within the target displacement range. Can be mounted in any orientation, increasing flexibility in vehicle design.
Leak-proof and gas-free, with a structure resistant to vibration and shock. Retains voltage for long periods if there is no parasitic draw.
Recommended Use and Displacement Compatibility
Daily Use:
Compatible with up to 250cc class motorcycles
e.g.) Scooters / Small displacement street bikes / Compact naked bikes
Race Use (Enduro / MX):
Up to 450cc class vehicles with electric starters
* AG-801 recommended specifically for 2-stroke 250cc
Race / Track Day (4-cylinder 600cc sports bikes):
Compatible for 600cc inline-4 race use such as the CBR600RR
However, AG-801 is recommended for daily use or mixed street riding.
Custom Vehicles:
Ideal for up to 350cc class cafe racers / small-bore custom builds
Important Notes
The Small Case Series, including the AG-401, does not feature a full BMS.
It only has cell balancing functions and does not include overcharge/over-discharge protection.
Therefore, this model is primarily intended for closed-course (race) use only.
When installing on vintage vehicles (pre-1980s),
please ensure the voltage regulator is functioning correctly.
A faulty regulator can damage the battery through overcharging.
Included Items
Lithium battery unit
Foam spacer set
Mounting terminal bolts
Warranty
3-year warranty (subject to manufacturer terms)
Before You Order
〇 Regarding Import Consumption Tax
At Shaftoya Shopping Site, we cover the import consumption tax incurred at the time of import on your behalf, so there are no additional charges beyond the total amount paid at checkout.
〇Compatibility Check
Our entire product database is based on North American vehicles (USDM). Please confirm whether the product can be installed on a Japanese domestic model (JDM) before ordering. (If you are unsure if a listed product fits your vehicle, please feel free to contact us. Our support team will be happy to look it up for you.)
If you 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, it does not guarantee that the product will fit Japanese models without modification.
All product descriptions are translated into Japanese using translation software. As there may be ambiguous phrasing, please contact us before ordering if you have any questions.
○ Regarding Delivery
Shipping costs are paid at the time of checkout. Shipping estimates are calculated automatically once you enter your delivery 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.
Essentially, 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 ample time when ordering. If you are in a rush, please inquire about lead times beforehand. Note that all products are transported by air; they are not shipped by sea.
○ Regarding Compliance with Japanese Vehicle Inspection (Shaken)
All products we handle are designed and manufactured outside of Japan. Please understand that they do not comply with the "Japanese Vehicle Inspection System," and we cannot provide documents such as strength calculation sheets for that purpose. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off-road," and installation and use are entirely at your own risk.
○ Regarding Warranty
Please check the contents of your order immediately upon arrival. As all products are shipped internationally from outside Japan, there may be damage to the shipping box or product during transit. We will only provide returns, refunds, or exchanges for products with shipping damage, defective goods, or items different from what was ordered if you contact us within 7 days of receipt. Please understand that for products sold through us, support regarding warranties will be handled "only through us." We do not provide support through other companies or distributors located in Japan.