In most Ford Focus models, the battery is a 12-volt lead-acid unit used to start the engine and power accessories. In Focus Electric, the vehicle uses a high‑voltage lithium‑ion battery pack for propulsion.
The exact battery type varies by model year, market, and whether the car is equipped with Start-Stop technology. This article outlines the common 12V configurations and the Focus Electric battery arrangement you’re likely to encounter.
Standard Focus (gasoline/diesel): 12-volt battery configurations
Below are the typical 12-volt battery setups found in non-electric Focus models, depending on generation and Start-Stop equipment.
- 12-volt sealed lead-acid battery (maintenance-free), the most common choice in newer Focus models.
- Enhanced Flooded Battery (EFB) 12V option for cars with Start-Stop systems but without the most demanding electrical loads.
- Absorbent Glass Mat (AGM) 12V battery for higher electrical demand or more aggressive Start-Stop use.
When replacing the 12V battery, check the battery label or the owner's manual for the exact specification (EFB or AGM) and the required capacity in amp-hours (Ah) and cold-cranking amps (CCA).
Focus Electric: high-voltage traction battery
The Focus Electric uses a dedicated high-voltage lithium-ion battery pack to power the electric motor. This pack is separate from the 12-volt system and is not user-replaceable in the same way as a conventional 12V battery. The pack’s capacity is commonly listed around 23 kilowatt-hours (kWh), with a nominal system voltage in the hundreds of volts range, depending on year and configuration.
Battery pack details
- Type: Lithium-ion chemistry battery pack for propulsion (commonly lithium nickel manganese cobalt oxide, or similar NMC formulations).
- Capacity: approximately 23 kWh (net usable energy).
- Voltage: nominally around 400 volts (varies by model year).
- Access and maintenance: Not user-serviceable; replacement performed by dealers or specialists.
For owners, the high-voltage pack is a sealed component that is managed by the vehicle’s battery management system. Regular maintenance focuses on the 12-volt system and charging equipment rather than the traction pack itself.
Summary
In summary, a conventional Ford Focus generally uses a 12-volt lead-acid battery, with EFB or AGM variants used for Start-Stop-equipped models. The Focus Electric relies on a separate high-voltage lithium-ion battery pack for propulsion, around 23 kWh in capacity, with the 12-volt system supported via a DC-DC converter. Always verify the exact specification for your vehicle’s year and market in the owner’s manual or on the battery label.