Using a car jump starter: best practices

Portable car jump starter units are convenient and increasingly common, but they work best when used correctly. Most modern units include built-in protections like reverse-polarity detection and spark suppression; these safety features are helpful, but they don't replace proper technique.

Start by reading the manufacturer's instructions. A compact lithium battery jump starter typically stays charged for months, but it should be topped up periodically. When you're ready to use it, turn off all accessories, attach the positive (red) clamp to the positive battery terminal, then attach the negative (black) clamp to a solid unpainted metal point on the engine block or chassis — not directly to the negative terminal if you can avoid it. Allow the unit a few seconds to stabilise before attempting to start the engine. If the car doesn't start right away, wait a short while and try again rather than cranking continuously.