Not every Infiniti has two batteries. Gasoline-only Infiniti models use a single 12-volt battery for starting and accessories, while electrified models (hybrids and EVs) include both a 12-volt battery and a high‑voltage traction battery used for propulsion.
To go into detail, Infiniti’s lineup spans traditional gasoline vehicles and electrified options. The term “two batteries” typically refers to the combination of a conventional 12‑volt battery plus a high‑voltage battery on hybrids and electric vehicles. The exact configuration varies by model year and powertrain, so checking the specific vehicle’s documentation is recommended.
Types of Infiniti powertrains
Infiniti offers three broad powertrain categories, each with its own battery configuration:
- Gasoline-only models: Rely on a single 12-volt battery to start the engine and power electronics.
- Hybrid models: Use a 12-volt battery plus a high-voltage traction battery that powers the electric motor(s). A DC-DC converter keeps the 12-volt battery charged from the high-voltage pack.
- Electric vehicles (EVs) and plug-in hybrids (PHEVs): Rely on a high-voltage battery for propulsion, with a 12-volt system supporting accessories via a DC-DC converter.
In practice, the two-battery arrangement is present in electrified Infiniti models, while gasoline-only cars typically rely on a single 12-volt battery. The exact setup can be confirmed by checking the model’s drivetrain specification in the owner’s manual or with a dealership.
Locations and maintenance considerations
Where the batteries live and how they’re maintained varies by system, but the general layout is consistent across Infiniti’s electrified offerings:
- 12-volt battery: Usually located in the engine bay or near the front of the vehicle, it powers starting and 12-volt electronics like lights and infotainment.
- High-voltage traction battery: Located under the floor or in a dedicated bay, it provides energy for propulsion in hybrids/EVs.
- DC-DC converter: Converts high-voltage energy to 12-volt power to keep the 12-volt battery charged and to run auxiliary systems.
Maintenance notes: The 12-volt battery in gasoline Infiniti models typically lasts several years and is replaced as needed. Hybrid and EV battery packs are designed for longer life and are covered by specific warranties; replacements are less frequent but can be costly. Always follow the owner’s manual and rely on qualified technicians for any work involving high-voltage systems.
Safety and identification tips
High-voltage systems require proper safety precautions. Do not attempt to service or access high-voltage components unless you’re trained and equipped for such work. If you’re evaluating a used Infiniti, verify both the 12-volt and, if applicable, the high-voltage battery’s health and warranty status with official documentation.
- Look for drivetrain badges or model markings like HEV/Hybrid or EV to indicate electrification.
- Check the owner’s manual or dealer confirmation to understand whether your model uses a high-voltage battery in addition to the 12-volt battery.
- Be aware that a DC-DC converter is used to keep the 12-volt battery charged in electrified models.
For consumers, the presence of two batteries is basically a hallmark of electrified powertrains. If a vehicle is gasoline-only, there is typically only a single 12-volt battery in the system.
Summary
The concise answer is: Infiniti cars do not universally have two batteries. Gasoline-only models use one 12-volt battery, while electrified models (hybrids and EVs) add a high-voltage traction battery in addition to the 12-volt battery. Check the specific model and year to confirm the exact battery configuration, and rely on official documentation for maintenance and safety guidance. As Infiniti’s lineup evolves, so may the exact battery arrangements; when in doubt, consult an Infiniti dealer or the vehicle’s technical documentation for the most current information.
Why does the Infiniti Q50 have two batteries?
What kind of batteries does INFINITI use? This answer will depend on what model of INFINITI vehicle you drive. Not only do larger vehicles, like SUVs, typically need larger batteries than sedans, but if you have an INFINITI Q50 Hybrid, this system actually contains two batteries to provide different voltage levels.
How much is a new battery for an Infiniti?
Depending on power, size, and quality, prices for a replacement car battery range from about $45 to $250.
Do most new cars have two batteries?
Many modern vehicles may use two or more batteries — including hybrids, EVs, diesels, and even some conventional models. Auxiliary batteries provide extra cranking power, preserve computer settings, and run features that remain active after shutdown.
What happens if the auxiliary battery dies?
It's unlikely that you'll notice any drivability problems with your vehicle once the auxiliary battery fails. The worst thing that could happen is that you won't be able to use the electrical components that get voltage from the auxiliary battery.