Hybrid battery problems courtesy of wiring faults are becoming a common cause of breakdowns with the increasingly popular petrol-electric cars. The old cliché is that modern cars have more computing power than the first Apollo moon rockets. It’s true but it also means they have more wiring. And the more complex the electronics, the greater the capacity there is for something to go wrong. Here we look at how battery problems can afflict cars that use electricity to supplement petrol or diesel power.
What kind of breakdowns hit hybrid cars?
Hybrid cars use complicated electronics to switch between battery power and the internal combustion engine. It’s this control module that can cause reliability problems. The only hybrid model in the UK Reliability Index top 100 most dependable cars is the Toyota Prius. In the US, independent reliability tester Consumer Reports claims that Tesla’s Model S had below average reliability.
Do hybrid cars have a conventional 12-volt battery?
Nick Reid, Green Flag technical expert explained: “Cars like the Toyota Prius will effectively have two batteries. There’s the high-powered battery that propels the car, and this has a 12-volt battery connected to it. This smaller battery will run all the equipment such as the audio system and electric windows. It needs replacing after five, six or seven years, like the battery in any other car. When we deal with a 12-volt battery problem on a hybrid car, we don’t go anywhere near the high-powered battery.”
How long do a hybrid’s propulsion batteries last?
Theoretically the batteries on a hybrid should last the life of the car. Toyota claimed: “The Prius battery (and the battery-power management system) has been designed to maximize battery life. In part this is done by keeping the battery at an optimum charge level – never fully draining it and never fully recharging it. As a result, the Prius battery leads a pretty easy life.
“We have lab data showing the equivalent of 180,000 miles with no deterioration and expect it to last the life of the vehicle. Since the car went on sale in 2000, Toyota has not replaced a single battery for wear and tear.” However, independent repairers claim there have been problems with hybrid propulsion batteries. Interestingly they believe repairing the batteries, rather than replacing them is the most reliable and cost-effective action. You can have the batteries on a first generation Toyota Prius rebuilt for around £700.
Why are the number of hybrid battery problems and breakdowns increasing?
Quite simply, there has been an explosion in the number of hybrid cars sold in the UK. And the more of something on the road, the more breakdowns there will be. Society of Motor Manufacturers and Traders EV figures show that 44,580 hybrid vehicles were sold in the UK in 2015, a 20 per cent increase on the year before. There are more than 10 times as many on the road as in 2012. This has been fuelled by demand and an increasing number of manufacturers supplying hybrid cars.
What exactly is a hybrid car?
Broadly speaking hybrids combine petrol or diesel engines with battery powered motors. The electric motor powers the car at low speeds and supplements the internal combustion engine when extra acceleration is needed. The electric motor is generally charged up by harnessing the kinetic energy that goes to waste when a regular car slows down or brakes. Plug-In Hybrid Electric Vehicles give owners the option of fully charging the battery via mains electricity.