We took note of the depth of detail and legibility of the instructions, and used each device to jump start a 1.6-litre Ford Focus with a flat battery a total of five times, with a gap of two minutes in between. Afterwards, we noted how much of the battery power had been consumed by recording how many lights had been extinguished. We were primarily looking for a balance between price and electrical punch because, while a jump starter is rarely used, it’s important to know that it will do the job when you need it, and yet there’s little point in paying for aspects you’re unlikely to use. We examined the technical specifications of the jump starters in our test to ensure their suitability for the majority of motorists. Once the engine is running, the car will begin to charge the battery itself, so once you remove the jump starter’s clamps from the battery, keep the engine running for 30 minutes or more to ensure the battery is charged enough to allow the next engine restart. In effect, jump starters allow power to be drawn through the battery to the car’s ignition system, but not enough to charge the battery in the traditional sense. Cars with this technology use Absorbent Glass Mat (AGM) batteries rather than conventional lead-acid items – use the wrong jump starter and you could seriously damage the battery. Most modern cars feature start-stop technology, which cuts the engine when the vehicle is stationary and fires the engine when you dip the clutch in a manual or press the accelerator in an automatic. Can I use a jump starter on a car with a start-stop system? Just remember that diesel engines usually require more power than petrol engines to get them started. Usually, jump starters will have a maximum engine size they can start most will easily handle two-litre engines, but some can crank over four-litre engines or even more. Amps will be displayed as Ah, milliamps as mAh – milliamps are simply amps divided by 1,000, so 5Ah is equivalent to 5,000mAh. When you’re choosing a jump starter, particularly one that may need to start a big, heavy engine, you’ll need to consider the amount of amps (or milliamps) it can supply.īest hotels in Brighton 2022: The greatest places to stay when you visit the seaside resortĪn amp is a measurement of the amount of electricity that can flow through a circuit: the more amps a jump starter can provide, the more oomph it will have to start an engine. You can certainly expect most jump starters to last six months laying dormant in your car before needing a charge. Pretty much anything with a battery will eventually go flat, but the beauty of a jump starter is that you can charge it from home, chuck it in the boot of your car and forget about it until you really need it. Size really doesn’t matter when it comes to jump starters – many of the best are tiny, yet can start huge engines. They can be the size of a tablet computer up to the size of a cereal box, depending on the features the jump starter has and the type of battery technology it uses. You can think of jump starters as a portable battery in a box. How to buy the right jump starter for you Are jump starters portable?
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