Do Hybrid Cars Use 12V Batteries Too?

When people think about hybrid vehicles, the focus is usually on the high-voltage battery pack that works alongside the petrol engine. But just like petrol, diesel, and full electric cars, hybrids also use a 12V battery, and it plays a much bigger role than most drivers realise.

Why Hybrids Still Need a 12V Battery.

Every hybrid vehicle has two power sources:

A high-voltage battery that stores energy for electric drive.
A 12V battery that powers the electronics, comfort features, and safety systems.

The 12V battery is essential for:

Starting up the vehicle’s computer systems
Powering lights, locks, infotainment, and air conditioning
Running safety-critical systems like brakes, airbags, and steering
Keeping alarms and security active when the car is off

Without the 12V battery, a hybrid vehicle won’t even “boot up,” regardless of how much charge is left in the high-voltage pack.

Key Differences Between EVs and Hybrids

While both EVs and hybrids rely on a 12V battery, there are some differences:

Hybrid 12V batteries are often smaller, since the petrol engine can support charging and electrical loads.
EV 12V batteries typically face heavier demand, powering dozens of electronic control units.
Both systems, however, require the 12V battery to kickstart the vehicle electronics.

So even though hybrids have an internal combustion engine, their 12V battery is just as critical as in a fully electric car.

How Long Does a Hybrid 12V Battery Last?

On average, a hybrid’s 12V battery lasts 3–5 years, similar to petrol and electric cars. Factors that affect lifespan include:

Driving frequency (short trips can undercharge the battery)
Climate (extreme cold and heat shorten battery life)
Electrical load (modern hybrids also have advanced electronics)

Regular testing ensures you replace your battery before it fails.

Replacing a Hybrid 12V Battery

Hybrid vehicles often use specialised AGM or lithium 12V batteries designed to handle higher electrical demands. It’s important to:

Choose the correct battery type for your hybrid model.
Have it fitted by an expert to ensure compatibility with onboard electronics.
Avoid letting the 12V battery completely discharge, which can shorten its lifespan.

Keep Your Hybrid Reliable with Battery Town

At Battery Town, we don’t just look after petrol and electric cars — we’re also experts in hybrid 12V batteries. Our nationwide network provides:

Free battery health checks
The right 12V replacement for your hybrid
Professional fitting to keep your vehicle safe and reliable.

Visit Battery Town today to get your hybrid’s 12V battery checked and replaced by the experts.