Most Bentleys use a standard 12‑volt lead‑acid battery (usually AGM) for starting and electronics. In newer hybrid and plug‑in models, there are extra 48‑volt systems and high‑voltage packs to support the hybrid system and electric drive.
The exact setup depends on the model and year. Traditional, non-hybrid Bentleys rely on the 12‑volt starter battery; mild-hybrid models add a 48‑volt battery; plug‑in hybrids carry a high‑voltage battery pack for electric driving. This article outlines what to expect by model type.
The 12-volt backbone
Here is a quick look at the standard 12‑volt battery that powers starting and most daily electronics in Bentley models that aren’t plug‑in hybrids.
- 12‑volt lead‑acid battery, typically of an AGM (absorbed glass mat) type for reliability and tolerance to deep discharge.
- Used to start the engine, power lighting, infotainment, and other low‑voltage systems.
- Replacement is commonly done by a qualified technician; manufacturers often specify a particular group size and AGM specification.
- Life expectancy typically ranges in the several‑year span (often around 4–6 years, depending on use and climate).
In standard Bentley configurations, this 12‑volt battery remains the primary energy source for non‑drivetrain electronics, while the high‑voltage systems are kept separate from this starter battery by the vehicle’s electrical architecture.
The 48-volt mild-hybrid layer
Many modern Bentleys include a 48‑volt mild‑hybrid system that provides electric assistance, smoother start‑stop, and improved efficiency. This section covers how that setup typically works.
- There is a dedicated 48‑volt battery (lithium‑ion) that stores energy for the mild‑hybrid system, enabling functions like electric motor assist and seamless stop‑start.
- The 48‑volt system reduces fuel consumption and emissions by enabling smoother acceleration and more efficient idle management in many driving conditions.
- Service and replacement are generally handled by Bentley technicians; the 48‑V battery is not a consumer‑replaceable unit in most markets.
Model coverage for the 48‑V system spans a wide range of Bentley models introduced in the late 2010s and beyond, including many Continental GT, Flying Spur, and Bentayga variants. Specifics can vary by model and production year.
Model coverage
In broad terms, the 48‑V mild‑hybrid system appears across most non‑plug‑in Bentley models produced in the last several years, but always verify with the owner’s manual or a Bentley dealership for your exact configuration.
High-voltage battery in plug-in Bentley models
Plug‑in hybrids in the Bentley lineup use a high‑voltage battery pack to enable all‑electric driving for portions of a trip, in addition to the 12‑V and 48‑V systems described above.
- Bentayga Hybrid and other plug‑in variants use a high‑voltage lithium‑ion battery pack (typically around 14 kWh nominal, with usable capacity sufficient for short all‑electric runs).
- The high‑voltage battery powers an electric motor alongside the internal combustion engine and can be charged via standard home charging or public charging networks.
- Accessing or replacing the high‑voltage pack is a job for trained technicians at an authorized Bentley service center, and the pack is covered under specific warranty terms.
High‑voltage packs enable limited all‑electric driving and a combined powertrain setup that prioritizes performance as well as efficiency. Availability and specs can vary by market and model year.
Summary
In short, a Bentley’s battery setup can include three layers: the standard 12‑volt battery for starting and everyday electronics, a 48‑volt lithium‑ion battery for mild‑hybrid assist, and, in plug‑in hybrids, a high‑voltage battery pack that enables electric driving. Always check your exact model’s specifications in the owner’s manual or with an authorized Bentley service center, as configurations and capacities evolve with model year and regional requirements.