Antigravity Group-35/Q85 Lithium Car Battery
Upgrade your vehicle’s starting power and drop serious weight with the Antigravity Group-35/Q85 lithium car battery. Built on safe, stable LiFePO4 chemistry with a full Battery Management System and Antigravity’s exclusive RE-START wireless jump-starting, it’s a direct Group 35/Q85 replacement that delivers huge cranking amps in a compact, ultra-light package.
High power, low weight, direct-fit Group 35/Q85 replacement
Key Features
Direct OEM case size: Group 35/Q85 (drop-in replacement)
Dimensions (L×W×H): 9 × 6.85 × 8.6 in
Capacity: 40 Amp Hours
Cranking power: 1500 Cranking Amps
Exclusive RE-START Technology: wireless jump-starting from the included keyfob
Complete Battery Management System (BMS) built in for protection and longevity
LiFePO4 chemistry for enhanced thermal stability and safety
Ultra lightweight: about 13.75 lbs (up to ~70% lighter than lead-acid)
Threaded terminals: M8 × 1.25
Shipping note: Adult signature required
SKU: 35-40-RS
Why It’s Better
This battery delivers significantly higher cranking performance than typical lead-acid Group 35 units while trimming major weight from the nose of the car. The integrated BMS monitors voltage, temperature, and cell balance, while RE-START gives you a built-in reserve so you can recover from an accidental drain without opening the hood or calling for a jump.
Suggested Fitments (Group-35/Q85 vehicles)
Acura NSX, Acura RDX, Mitsubishi EVO models, and various Subaru applications that utilize Group 35/Q85 sizing. Always confirm tray dimensions, terminal orientation/polarity, and hold-down style on your specific vehicle before purchase.
What’s Inside
Antigravity Group-35/Q85 lithium battery
Wireless RE-START keyfob
User documentation
Installation Notes
Verify positive/negative terminal locations match your vehicle. Ensure proper hold-down engagement and cable strain relief. After installation, start the vehicle and confirm charging voltage per the manufacturer’s guidance.
Antigravity Group-35/Q85 Lithium Car Battery FAQs:
Is this a direct replacement for Group 35 or Q85 batteries? Yes, it’s built in the Group 35/Q85 OEM case size for drop-in fitment in vehicles that use this size. Always confirm dimensions and terminal orientation before ordering.
Do I need a special charger? Most modern smart chargers that support lithium (LiFePO4) profiles are compatible. Avoid chargers with desulfation or repair modes designed for lead-acid batteries.
How does RE-START work? RE-START maintains a reserve. If the battery is drained, press the keyfob button to temporarily re-enable power so you can start the car and allow the alternator to recharge the battery.
Is LiFePO4 safe for automotive use? LiFePO4 chemistry offers strong thermal stability, and the built-in BMS adds over-/under-voltage, over-current, and temperature protections when used as directed.
Will it work in cold weather? LiFePO4 performance can dip at very low temperatures. For cold starts, briefly turn on electrical loads (lights, defroster) for a minute to warm the cells, then crank. Check the manufacturer’s recommended temperature ranges.
What vehicles will it fit? Common Group-35/Q85 vehicles include Acura NSX/RDX, Mitsubishi EVO models, and many Subarus. Confirm tray size, terminal layout, and hold-down type for your exact trim and year.
Ready to cut weight and add serious cranking performance? Drop the Antigravity Group-35/Q85 Lithium Car Battery into your build and feel the difference every time you hit the starter.
VIDEO
NEW! Lightweight Lithium Batteries with Wireless Remote Built-In Jump Starting!
Antigravity Batteries has changed the game again with their latest Lithium-ion Car Batteries. The newest RE-START line of batteries offers built-in WIRELESS Jump-Starting! That means if your battery is ever discharged, simply press the button on the provided key fob, start the car, and drive away! No need for a jump starter or roadside assistance. You don’t even have to open the hood—activate it from inside your vehicle!
If you want to track your battery status via Bluetooth, you can use the Bluetooth Battery Tracker PLUS (sold separately).