Battery Holder BMW G20 G21 G22 Battery Tray Box Storage Mount Holder 8780791

Battery Holder BMW G20 G21 G22 Battery Tray Box Storage Mount Holder is an original battery holder designed for the luggage compartment of modern BMW 3 and 4 Series models. It provides a stable, secure mounting for the traction battery, protecting it from shifting during driving and reducing the transmission of vibrations to the electrical system. Thanks to its OEM design, the holder guarantees precise fitment to factory mounting points and ensures proper routing of cables and covers.

Specifications and technical data

• SKU: 8780791
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8780791
• Substitutable numbers: 8780791, 61218780791
• Category: Other Engine Parts

Purpose and function of the battery holder

The presented battery holder is a structural component responsible for stable battery seating in the vehicle's body. Its purpose is to:

• maintain the battery in a fixed position during acceleration, braking, and cornering,
• reduce the risk of battery casing damage resulting from looseness or vibrations,
• ensure proper support and load distribution on the body structure,
• enable correct routing of power cables and cover mounting elements.

By using an original design solution, the holder works with factory mounting points, which facilitates service and maintains compliance with BMW technical documentation.

Construction and fitment for BMW G20 / G21 / G22

The battery holder has been designed specifically for the G-series body architecture, which translates into exact alignment with the trunk floor and trim elements. The design accounts for:

• profiling matched to the shape of the battery used in these models,
• locations for factory bolts and mounting clamps,
• space for routing cables and any necessary covers or shields.

This solution minimizes the risk of stress on the battery casing and eliminates the need for modifications that could negatively affect the safety or durability of the electrical system.

Benefits of using the original holder

Using the original battery holder in a G-generation BMW 3 and 4 Series provides a number of practical service and operational benefits:

• Compatibility with the factory mounting system – no need for custom adapters or body modifications.
• Reduction of vibrations and noise in the trunk area due to proper battery support.
• Easier service access to the battery and surrounding electrical system components.
• Consistency with BMW service documentation, which is important for professional vehicle maintenance.

This solution is particularly recommended when replacing a damaged holder after a collision, due to corrosion of mounting elements, or during a comprehensive renovation of the rear body section.

Characteristics of the used part

The offered holder comes from disassembly, meaning it is an original BMW part with parameters consistent with the manufacturer's factory specifications. The used component allows for maintaining high quality and fitment while optimizing repair costs. In practice, this translates into:

• maintaining the factory geometry of the battery mount,
• no issues with compatibility with trunk covers and upholstery,
• the possibility of an economical repair without sacrificing original BMW technology.

Expansion of the mounting system and technical knowledge

If you are planning a comprehensive repair or upgrade of the power and battery mounting zone in your BMW and need other elements from the same group, such as additional brackets, clamps, or mounting covers, check the available parts in the Other BMW category.

For a comparison of design solutions used in sports models of other brands and a better understanding of the differences in powertrain construction and the accompanying infrastructure (including power supply and component mounting), it is worth reading the article Audi RS vs other models – what is hidden under the hood and chassis?, which discusses, among other things, changes in engines, brakes, and chassis in the context of more demanding operation.