The short answer: only certain Malibu models from that year used a second, high-voltage battery as part of a mild-hybrid system. Most Malibu cars relied on a single traditional 12-volt battery for starting and accessories.
Two battery systems in the 2014 Malibu
To understand why some Malibus have two batteries, it helps to know how the lineup was configured in 2014. The presence of a second battery is tied to a specific technology GM offered at the time, not to every trim level.
- The standard 12-volt battery — This battery handles starting the engine and powering conventional electrical loads such as lights, radios, and accessories.
- A dedicated high-voltage energy-storage system — On Malibu Eco models equipped with GM’s eAssist mild-hybrid technology, there is a separate battery pack used to store energy for the electric motor/generator and to provide propulsion assist. This system operates alongside the conventional 12-volt battery.
In short, if your 2014 Malibu is not the eAssist/mild-hybrid variant, it won’t have the high-voltage pack tied to a hybrid system. If it is an eAssist-equipped model, the two-battery setup is intentional and central to the car’s fuel-saving design.
How the eAssist system works
What the high-voltage battery does
The eAssist setup adds a motor/generator that can assist the gasoline engine during acceleration and recapture energy during braking. The high-voltage battery pack stores this recovered energy and powers the electric assist motor when needed, improving efficiency without turning the Malibu into a full hybrid.
Relation to the standard 12-volt battery
The conventional 12-volt battery continues to power starting, lighting, and standard electronics. The two systems are separate by design: the 12-volt system handles everyday tasks, while the high-voltage pack serves the hybrid-like boost functions. Servicing and repairs of the high-voltage system should be done by trained technicians due to safety considerations.
How to tell if your Malibu has eAssist
If you’re trying to determine whether your particular 2014 Malibu uses the two-battery setup, look for these indicators.
- Badging or model designation — Malibu Eco or eAssist badges on the trunk or doors often indicate the hybrid/mild-hybrid variant.
- Owner’s manual or window sticker — The documentation will specify if the car uses a high-voltage eAssist system and a separate battery pack.
- Battery layout clues — In eAssist-equipped models, there is a high-voltage energy-storage system in addition to the standard 12-volt battery; technicians will confirm the presence of the two systems during service.
If you’re unsure, ask a Chevrolet dealer or a qualified automotive technician to verify whether your specific vehicle is the eAssist/mild-hybrid variant and to review the battery setup.
Maintenance and safety considerations
Two-battery configurations require careful handling, especially the high-voltage pack. Here’s what to keep in mind:
- Do not attempt to service or jump-start the high-voltage system yourself. Use proper safety procedures and trained personnel.
- If the vehicle experiences unusual electrical issues, a dealership or qualified hybrid-specialist should diagnose both the 12V battery and the high-voltage pack.
- Follow manufacturer guidance for battery maintenance, including regular checks of the 12-volt battery’s condition and ensuring the charging system is functioning properly.
Understanding the two-battery setup helps owners know when a service appointment is needed and what components are involved in keeping a 2014 Malibu running efficiently.
Summary
In 2014, the Malibu could come with two batteries only if it was the eAssist mild-hybrid variant. The 12-volt battery handles standard starting and electronics, while the high-voltage battery pack powers the electric motor assist and energy recovery. If you drive a non-hybrid Malibu, you typically won’t have the second battery. Always consult a qualified technician for diagnosis or service involving the hybrid system.