The Outlander uses two different battery systems depending on the variant: a conventional 12-volt auxiliary battery on non-hybrid models and a high‑voltage lithium‑ion traction battery on the plug‑in Outlander PHEV. Exact specs vary by year and market.
In this explainer, we break down the two battery systems, what they do, and how owners should think about maintenance, replacement, and charging. The goal is to clarify which battery you’ll encounter depending on your Outlander model.
Two battery systems, two roles
Gasoline and non-hybrid Outlander: 12V auxiliary battery
For the gasoline-only Outlander, the 12‑volt battery powers starting and the vehicle’s electronics when the engine is off, and it handles accessories when the engine isn’t running.
- Type: 12‑volt lead‑acid battery; newer trims may use an Absorbent Glass Mat (AGM) design for improved durability
- Common sizes: typical automotive battery in the 40–70 Ah range, depending on trim and market
- Replacement: replaced like a standard car battery through auto parts outlets; verify correct size, terminal layout, and polarity
- Maintenance: minimal beyond periodic checks for charge level and terminal corrosion
For most owners, this is the conventional battery you’d replace when it weakens, separate from the high‑voltage hybrid system.
Outlander PHEV: high‑voltage lithium‑ion traction battery
The plug‑in Outlander uses a dedicated high‑voltage traction battery to power the electric motor and store energy for hybrid operation. This pack is charged via the plug and through regenerative braking and is not a standard 12‑volt battery you replace at a parts counter.
- Chemistry: lithium‑ion (commonly nickel‑manganese‑cobalt oxide, or NMC)
- Capacity: roughly 12 kWh nominal, with usable capacity typically around 11–12 kWh depending on year and market
- Voltage class: high‑voltage pack designed for hybrid/electric drive; not a user‑replaceable 12‑volt car battery
- Maintenance and replacement: generally handled by a dealer or qualified technician under warranty; charging equipment and safety systems protect the pack
In the Outlander PHEV, the battery is a core energy reservoir for electric propulsion and is subject to different service procedures than the 12‑volt system.
Summary
Two distinct batteries serve different purposes in the Outlander lineup. Gasoline/non‑hybrid models rely on a conventional 12‑volt lead‑acid (often AGM) auxiliary battery for starting and electronics. The Outlander PHEV uses a high‑voltage lithium‑ion traction battery, with about a 12 kWh capacity, to power the electric drive and store energy for charging. Always check your specific year and market for exact specifications, and consult your owner’s manual or a Mitsubishi dealership for service guidance.