Why Electric Cars Have Regular 12V Car Batteries

Manufacturers are investing huge sums into battery technology to maximize the range and performance of new electric cars. However, if you pop the hood of a modern EV, you might find a regular old 12-volt car battery. That may be a confusing experience, but fear not — we’ll explore why that’s there, and uncover the secrets of an electric car’s 12 volt systems while we’re at it.

The 12V battery nestled in a Tesla Model 3. These batteries often fail in EVs, as they don’t draw high current from the lead-acid battery on starting like an ICE does. It’s believed this high current draw regularly breaks up deposits that build up on the plates of the battery, helping it last longer. EVs don’t do this, and 12V battery failures are common.

Most electric cars get around with just one big, high voltage battery pack full of rechargeable lithium cells that drive the motor. But, EVs also have a regular old 12 volt lead-acid

Read more