Antigravity H7 40Ah RE-START Lithium Battery for BMW F8X M3 / M4 (and M2 where applicable)

Looking to pull real weight out of your car without giving up reliability? Antigravity’s RE-START lithium batteries are direct-fit replacements for the factory H7 lead-acid unit in the BMW F8X M3 / M4 (and M2 where applicable), built for modern performance and track-driven cars. You get a major weight reduction, stronger cranking performance and smart electronics that help protect the battery if the car sits.

Lightweight, OEM-Size Upgrade

• OEM H7 case size for a true drop-in fit in the applications listed for this battery.
• Often up to around 70% lighter than comparable lead-acid batteries, taking significant weight off the nose of the car.
• High cranking output for confident starts in cold weather and after heat-soaked sessions.
• Durable LiFePO4 lithium chemistry and an internal Battery Management System (BMS) for long service life and safety.

RE-START Smart Protection

The RE-START line integrates a full BMS that monitors voltage, temperature and current. If the battery is accidentally discharged (lights left on, the car sitting too long), the BMS can place the battery in a protected sleep state before it is damaged, reserving enough energy for a restart.

• Wireless keyfob and on-battery button to wake the battery and start the car if it has gone into RE-START mode.
• BMS protections for over-discharge, over-charge, short circuit and over-temperature operation.
• Lower self-discharge than lead-acid, so the car can sit longer between drives when parasitic draw is under control.

Capacity and Use Case

This configuration is rated at approximately 40 amp-hours and is sized for owners who want a strong balance between weight savings and real-world usability on dual-purpose street/track cars with moderate electrical loads.

• Approximate cranking output: around 1500 cranking amps (check Antigravity’s latest published specifications for exact values).
• All capacity options share the same external H7 case dimensions for easy installation.

If you are unsure whether this is the right size for your specific platform and use case, reach out and we can recommend the best option based on your car, climate and how often it is driven.

Installation and Charging Notes

• Direct-fit H7 case for the applications listed on this page; no custom mounts needed in most supported chassis.
• Always use a LiFePO4-compatible charger when charging off the car.
• On many late-model cars, battery registration or coding is recommended after installation for proper charging strategy and battery life.
• For cars that sit for long periods or have higher parasitic draw, we suggest pairing the battery with a lithium-safe maintainer or Antigravity’s monitoring solutions.

Important: While the RE-START system offers an extra layer of protection, it is not a substitute for proper wiring, good grounds and managing parasitic draw.