(Last Updated On: August 22, 2018) If you’re looking for a detailed and easy to follow guide on how to use a portable jump starter car battery charger, you have definitely come to the right place. Everything you need to know about your jumper box has been compiled here for you. Before moving onto the guide though, here is a useful comparison table of the best jump starters of 2018. Particularly popular at the moment are the, the and the.

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• • • • • Key Safety Precautions for How to Use a Jumper Box The has a multitude of overlapping safety systems in place to prevent any mishap from happening when jump starting your car, including short circuits, overvoltages and sparking thanks to spark-proof jumper clamps. The following should always be observed when attempting to jump start any vehicle, piece of garden equipment, boat, and so on (simply referred to as vehicle from here on) with a portable jump starter: • Ensure the jump starter is off before attempting to connect the jumper leads to the unit and the vehicle’s battery • Check that the lights, radio, air-conditioner, etc. Of the vehicle are turned off – remove the keys from the ignition entirely to be sure • Do not allow the positive and negative clamps to contact each other or to be electrically connected in some way by a conductor of sorts • Do not attempt to jump start your vehicle near flammable liquids or other combustibles Explosions of Lead Acid Batteries are Possible but Rare While most modern portable jump starters have safety systems in place to prevent any potentially hazardous situations from the incorrect use of the device, it is wise to always follow the above key points. An explosion is a real possibility, and if a lead-acid battery is involved, it goes without saying that this can really be a disastrous situation.

Sparking is also a possibility if the jumper clamps contact each other or if they are connected to the vehicle while the jump starter is on and hence the warning to keep flammables clear of the area where the jump starting is going to take place should also be taken seriously. With the above precautions in place, the main part of the guide will now be covered.

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The following is essentially the best-practice for jump starting your vehicle with a portable jump starter and should therefore be followed as close as possible. Alternative, and perhaps more familiar, practices are however indicated where applicable along with their possible effects on safety. How to Use a Jump Starter • Connect the jump cables to the portable jump starter while still in the off position. Some units have the cables permanently attached such as the and so this step can be ignored in these cases.

• The safest practice when jump starting your vehicle with a portable jump starter is to connect the positive jumper cable to the positive terminal of the battery, and the negative to the vehicle chassis. Next, still with the jump starter and vehicle completely off, connect the positive (red) jumper clamp to the positive terminal of the vehicle’s battery and the negative (black) clamp to a stable point on the vehicle’s chassis. Be sure the clamps are solidly connected so that when the car starts, they’re not shaken loose, possibly leading to the cables touching other and shorting the jump starter. Connecting the negative jumper clamp to the negative terminal on the vehicle’s battery is perhaps a more common practice, and for most situations, will be fine.

The negative terminal on the battery of essentially all cars, SUVs and trucks also serves as ground for the battery by being connected to the chassis of the vehicle. Therefore, connecting to the chassis of the car is virtually the same as connecting to the negative terminal of the battery. The reason for preferably connecting to the chassis, is that the vehicle’s battery could potentially be giving off hydrogen gas. Although quite unlikely, especially on modern car batteries, a spark from connection of both jumper cables to the battery terminals could cause a fire or explosion.

The chances of this are slim, but this is the reason why best-practice would dictate connecting the negative cable to the vehicle’s metal frame. The most common way of connecting a jump starter to your vehicle battery is with both both jumper leads attached to the terminals of the battery. While reasonably safe, lead acid batteries can actually leak hydrogen and so any sparking on the terminals could possibly lead to a fire or explosion. • With the jumper cables now firmly connected to the vehicle’s battery, the jump starter can now be turned on. • Next, the ignition of the car can be turned on and an attempt made to start the car. If the motor does not immediately turn-over, do not crank the engine for more than about 5 seconds.