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Shave Real Weight From Your Focus RS Engine Bay
The GrimmSpeed Lightweight Battery Mount Kit gives Focus RS and Focus ST owners a secure way to run a lightweight battery in place of the heavy factory unit. The factory Ford Focus battery tips the scales at roughly 44 pounds, and swapping to a lightweight battery with GRM121023 shaves about 30 pounds from the front of the car with no cutting or drilling required. The laser cut, CNC bent steel bracket is finished in a durable black texture powdercoat and includes mounting provisions for the OEM distribution block, so your factory wiring stays clean and functional. GRM121023 is designed to work with the Odyssey PC680 battery or similarly sized lightweight batteries, giving autocross and track day drivers an easy path to meaningful weight savings.
Key Features
- Laser cut, CNC bent steel bracket for a precise factory style fit
- Durable black texture powdercoat finish resists corrosion
- Retains mounting provisions for the OEM distribution block
- Compatible with the Odyssey PC680 battery or similarly sized batteries
- No cutting or drilling required for installation
- Removes roughly 30 pounds versus the factory battery setup
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2016-2018 | Ford | Focus | RS |
Specifications
| Detail | Value |
|---|---|
| Brand | GrimmSpeed |
| MPN | GRM121023 |
| Material | Steel |
| Finish | Black Texture Powdercoat |
| Battery Compatibility | Odyssey PC680 or similar size |
| UPC | Not published by manufacturer |
What's Included
- 1 GrimmSpeed lightweight battery mount bracket
- Mounting hardware
Battery and terminals are not included.
About GrimmSpeed
GrimmSpeed is a performance manufacturer known for its Subaru lineup that also extends its engineering approach to platforms like the Ford Focus RS and ST. Every part is designed for real world durability and straightforward installation, helping enthusiasts shed weight and improve performance without unnecessary complexity.
FAQ
What is the GRM121023?The GRM121023 is a GrimmSpeed Lightweight Battery Mount Kit built for the 2016 to 2018 Ford Focus RS.
Does GRM121023 include a battery?No, GRM121023 is the mount kit only. The Odyssey PC680 battery and terminals are sold separately.
How much weight does GRM121023 save?Switching to a lightweight battery with GRM121023 removes roughly 30 pounds compared to the factory battery setup.
Does GRM121023 require cutting or drilling?No, GRM121023 is designed to install without any cutting or drilling.
What battery works with GRM121023?GRM121023 is designed around the Odyssey PC680 battery or other batteries of a similar size.
Does GRM121023 retain my factory distribution block?Yes, GRM121023 includes mounting provisions to keep the OEM distribution block in place.
What finish does GRM121023 use?GRM121023 uses a durable black texture powdercoat finish over a laser cut, CNC bent steel bracket.
Does GRM121023 fit the Focus ST as well?GrimmSpeed also offers this bracket for the Focus ST, though the listed fitment for GRM121023 here is the 2016 to 2018 Focus RS.
Install Instructions
- Disconnect the negative and positive terminals from the factory battery.
- Remove the factory battery and tray from the engine bay.
- Remove the OEM distribution block from the factory tray and set aside.
- Install the GRM121023 bracket in place of the factory tray using the provided hardware.
- Reattach the OEM distribution block to the new bracket.
- Set the lightweight battery into the new bracket and secure it per the included instructions.
- Reconnect the negative terminal first, then the positive terminal.
- Confirm the battery is secure and all connections are tight before closing the hood.
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