Tesla Roadster

12 Volt Battery Replacement

The secondary 12 Volt battery, which provides power to Vehicle Management VMS, Horn, Headlights, Audio, Door Locks, etc. is located in the passenger wheel well.

The addition of this battery was an afterthought in the Roadster, with early cars feeding 12 Volt devices directly from the main ESS Battery Pack.

In 2.x Roadsters, a motorcyle battery was selected providing 12 Volts at 8 Amp Hours.

Our two replacement batteries are actually designed for electronics applications like this. One is a 12 Amp Hour battery, providing more power for peak demand like audio systems in the car, another replacement is a Lithium Ion battery.

This battery requires replacement every two years, usually alerting owners with the “SWP Aux Battery Error”.

If you want to avoid future costly replacements

Our 12 Volt battery relocation kit makes future battery replacements, a quick 3 minute DIY process.

Roadster 12 Volt Auxiliary Battery Options

Original 12V 8 Amp Hour Motorcycle Battery

Original 12V 8 Amp Hour Motorcycle Battery

Replacement 12V 12 Amp Hour Battery

Replacement 12V 12 Amp Hour Battery

Replacement 12V Lithium Ion Battery

Replacement 12V Lithium Ion Battery

Tesla Service Center

Gruber Motor Company is an independent Electric Vehicle Service Center specializing in Tesla vehicles, with extensive experience in the diagnostics, repair, maintenance, and restoration of Tesla electric vehicles.

As electric vehicles continue to transform the automotive industry, servicing them requires a new kind of expertise. Today’s advanced EV service centers increasingly combine traditional automotive repair with the capabilities of an electronics and engineering laboratory. Gruber Motor Company brings decades of experience servicing critical power systems, high-voltage electronics, battery systems, and power conversion equipment—technologies that share many of the same fundamentals found in modern electric vehicles.

Operating from our 18,000-square-foot service facility in Phoenix, Arizona, our engineers and technicians provide advanced EV diagnostics and repair while maintaining the personalized customer service of a traditional specialty automotive shop. We are particularly known for our expertise with the original Tesla Roadster, including battery systems, power electronics, diagnostics, component repair, restoration, and vehicle preservation.

In addition to specialized Tesla and EV services, Gruber Motor Company provides complete automotive support, including tires, brakes, suspension service, detailing, paint correction, powder coating, paint protection film (clear bra), cosmetic restoration, and vehicle upgrades.

Whether your Tesla requires routine maintenance, advanced electrical diagnostics, battery or power-electronics repair, or a comprehensive restoration, our goal is simple: provide knowledgeable service, clear communication, and solutions that keep these pioneering electric vehicles on the road.

We are proud of our EV Service Center of the Future

Our EV Lab is where Software and Electronics repairs take place

Gruber Motor Company
203 West Lone Cactus
Phoenix, Arizona 85027
EV@GRUBER>COM

602-863-2655 X500

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