The answer depends on the model: traditional Rolls-Royce cars use a single 12‑volt battery, while the all‑electric Spectre uses two battery systems (a high‑voltage traction battery and a 12‑volt auxiliary battery).
In Rolls-Royce's current lineup, most models such as the Phantom, Ghost, Cullinan, and Dawn rely on a conventional 12‑volt electrical system to run electronics and start the engine, with a DC‑DC converter powering auxiliary systems. The brand’s first fully electric model, the Spectre (launched in 2023–2024), introduces a large high‑voltage battery to power the electric drivetrain, while still maintaining a 12‑volt battery for low‑voltage systems. The 12‑volt battery is charged from the high‑voltage pack via the DC‑DC converter when applicable.
Battery configurations by model
To illustrate how the configurations differ between model types, consider the following:
- ICE models (Phantom, Ghost, Cullinan, Dawn) — powered by a traditional 12‑volt battery that handles starting and electronics; no separate traction battery is used.
- Spectre — a fully electric model that uses a high‑voltage traction battery for propulsion in addition to a 12‑volt auxiliary battery for low‑voltage systems; the 12‑volt side is charged from the high‑voltage pack via a DC‑DC converter.
In summary, the number of batteries varies by model: one 12‑volt battery in internal‑combustion models, and two battery systems (high‑voltage traction battery plus 12‑volt auxiliary) in the Spectre.
Implications for owners and maintenance
For non‑electric Rolls‑Royce models, maintenance focuses on the 12‑volt battery and associated electrical systems, typically following standard luxury‑car service intervals. For the Spectre, technicians also service the high‑voltage traction battery, including thermal management, health diagnostics, and charging system integrity. Authorized service centers use equipment capable of safely handling high‑voltage systems and DC‑DC charging pathways between the packs.
Summary
Rolls-Royce cars generally use one 12‑volt battery, while the brand’s first fully electric model, the Spectre, employs two battery systems: a large high‑voltage traction battery and a 12‑volt auxiliary battery. The exact count depends on the model you’re considering.