Antigravity Batteries Group-51R RE-START Lithium Car Battery (Wireless Emergency Restart / Full BMS Equipped)
The Antigravity Group-51R is a lightweight, high-power lithium battery that can replace a standard Group-51R battery. Its built-in RE-START (wireless jump-start) function allows you to restart your engine with the push of a button on the included remote control should the battery go dead.
Furthermore, it is equipped with full BMS functions (over-discharge / over-charge / short-circuit / overheat / cell balance protection), maximizing safety, durability, and battery life.
Compared to standard lead-acid batteries, it provides up to 70% (approx. 11–25 kg) in weight reduction, improving acceleration, braking, and handling.
Specifications (Group-51R)
Case Size: Approx. 23.9 × 13.2 × 21.8 cm (Length × Width × Height)
Capacity (Selectable):
30Ah → 1200 Cranking Amps
24Ah → 1000 Cranking Amps (for race-only vehicles)
Weight:
51R-30-RS: Approx. 5.1 kg (11.25 lbs)
51R-24-RS: Approx. 3.9 kg (8.5 lbs)
RE-START Function: Wireless remote included (also has a button on the battery unit)
Chemistry: LiFePO4
Management System: Full BMS included
Terminals: M8 × 1.25 threaded terminals
Features
The wireless RE-START function allows you to restart the engine from inside the car with a single remote control. Full BMS functions constantly monitor battery status to maximize safety and service life. High starting performance with up to 1200 Cranking Amps makes it compatible with high-compression engines and turbocharged cars.
Up to 70% weight reduction compared to stock batteries improves maneuverability, braking, and acceleration.
Excellent vibration and heat resistance; no leakage or gas emission.
Suitable for sports driving and circuit vehicles.
Capacity Selection Guide
30Ah:
Ideal for street driving + vehicles with electrical loads.
Examples: Idle-stop / constant-power accessories / ECU loggers / dash cams / audio systems, etc.
24Ah:
For race vehicles / circuit-only use where weight reduction is the priority.
Compatibility Examples (Vehicles equipped with stock Group-51R)
Honda Civic
Honda S2000
Mazda Roadster
Nissan GT-R (R35)
Other vehicles equipped with 51R batteries
Please let us know your vehicle model, year, and current battery part number, and we will check compatibility for you.
Package Contents
Lithium battery unit
RE-START wireless remote
Terminal bolts for installation
Instruction manual
Warranty
3-year warranty (in accordance with manufacturer's terms)
Before Ordering
○Regarding Import Consumption Tax
At the Shaftoya shopping site, we pay the import consumption tax incurred at the time of import on your behalf, so you will not incur any additional charges beyond the total amount paid at checkout.
○Confirmation of Compatibility
Our entire product database is primarily based on North American vehicles (USDM). Please confirm compatibility with Japanese vehicles (JDM) before placing your order. (If you are unsure whether 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 via the tabs on our homepage, it does not guarantee that they will fit a Japanese model vehicle without modification.
All products have been translated into Japanese using translation software. As there may be ambiguous expressions, please contact us before ordering if you have any questions.
○Regarding Shipping
Shipping costs are paid at the time of checkout. Shipping estimates are automatically calculated on the checkout page when you enter your shipping address. In rare cases, for large items such as body parts, there may be a significant discrepancy between the automatically calculated shipping cost and the actual shipping cost. In such cases, we will contact you individually by email.
All products are generally shipped internationally from our U.S. warehouse. Unlike domestic shipping in Japan, international shipping takes about 7 to 14 days, so please allow plenty of time for your order. If you are in a hurry, please contact us in advance to confirm delivery times. Note that all items are transported via air freight; they are never shipped by sea freight.
○Regarding Compliance with Japanese Vehicle Inspection (Shaken)
All products handled by our company are generally designed and manufactured outside of Japan. Please note that they do not conform to the "Japanese Vehicle Inspection (Shaken) system," and we cannot provide documents such as strength calculation reports for Japanese vehicle inspection purposes. 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. Since all products are shipped internationally from outside Japan, there may be shipping damage to the packaging or the product itself. We will only provide returns, refunds, or replacement products if you contact us within 7 days of receipt regarding damaged, defective, or incorrect items. Please understand that for products sold through us, warranty support will be provided "only through us." We do not provide support through other companies or distributors located within Japan.