There is always a risk of electronic damage when performing a jump start but there are ways to minimise it. We recommend using spike-protected jumper leads. Once you have correctly connected the jumper leads, do not start the car with the good battery. The engine of the vehicle with the good battery should not be running during the procedure. This helps reduce the voltage differential between the two batteries, which reduces the risk of a spike. After a car battery has been depleted it will need a full recharge using a battery charger.