While replacing a car battery used to be a fairly simple process, it’s often much more complicated in modern cars.

Step 6 Re-attach the battery-securing clamp, tighten the securing bolt, remove the rags from the battery terminals and reattach them, connecting the +ve one first.

What are the symptoms of a flat car battery? If your car’s 12V battery is dead, this will quickly become obvious as your car will fail to start, and the on-board electronics may also refuse to work.