Munich - Most car breakdowns are caused by defective batteries and the electronic system, according to figures released by Germany's automobile association ADAC.
About 40 per cent of 2.5 million breakdowns listed by the ADAC were a direct result of battery problems.
"This confirms a trend over several years," said ADAC spokesman Maximilian Maurer. Battery technology has remained the same for the past two decades while having to cope with more electronic equipment such as seat heating and electric windows.
"The average car battery today has a lifespan of between four and six years. More is just not possible," Maurer said.