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A flat battery often strikes at the worst possible moment: in a dark car park, on a cold morning or just before setting off with your caravan. With a car jump starter, you can try to start a vehicle with a flat 12V battery yourself, without needing another car or jump leads.
However, not every portable jump starter is suitable for your vehicle. Marketing often focuses on high amp ratings, large mAh figures and lots of extra features. Those numbers don’t tell the whole story. Below, you’ll find out which features are really worth checking and which models suit different needs.
A figure such as 2000A or 4000A sounds impressive, but peak current isn’t the same as continuous or cranking current. So check which engine type and capacity the device is designed for, according to its product specifications. A 12V jump starter for a small petrol car has different requirements from an emergency jump starter for a diesel van or motorhome.
Many models are designed for vehicles with a 12V lead-acid battery. Check your car’s handbook to confirm this. A jump starter isn’t automatically suitable for electric vehicles, hybrid systems or other battery types. Also bear in mind the difference between petrol and diesel engines: diesel engines generally need more power to start.
A jump starter with a power bank, LED light or fast-charging port is handy, but these features don’t replace good-quality jump leads with a safety system. Look for protection against reverse polarity, short circuits, overheating, overloading and sparks. These features reduce the risk of incorrect connection, but you should always follow the supplied instructions.
Compare at least these three points:
A car battery booster with a higher capacity isn’t automatically more powerful. The internal battery, cables, clamps and electronics all play a part.
Where possible, choose smart clamps with a clear status indicator or warning signal. A light that shows whether the connection is correct can help prevent mistakes. Metal or copper clamps can make a firm connection, but they should have well-insulated handles.
The usual procedure is:
A lithium jump starter is usually compact and easy to keep in your car. As well as the mAh rating, check its weight, dimensions and charging time. A larger model may offer more connections, but it’ll also take up more space.
Recharge the device after use. Also check its charge level regularly, even when you haven’t used it. Follow the maintenance schedule in the instructions, as this varies by model. Keep the device dry and avoid leaving it in a hot car for long periods.
Why it suits this type of user: According to its product specifications, this compact model weighs around 330 grams and is designed for 12V petrol and diesel vehicles, motorbikes and boats. That makes it handy for everyday use and for keeping in your glove compartment or emergency kit.
The product specifications state a peak current of 1200A, a cranking current of 600A and a clear engine limit. So you don’t have to rely on a big peak-current figure alone.
12.800mAh battery according to the product specifications, LCD display, USB output and LED light with three modes.
Why it suits this type of user: This model combines a 12V jump starter with a power bank, 12V output and LED light. According to its product specifications, it’s designed for motorbikes and cars with engines up to 8L petrol and 4L diesel.
The stated petrol and diesel limits make compatibility clearer than a general claim that it works with vehicles.
16800mAh, two USB ports, 12V output, LED light and a stated two-year warranty.
Why it suits this type of user: For SUVs, motorhomes, boats or frequent outdoor use, this model offers a 26800mAh battery, 65W charging and a 150W DC output, according to its product specifications.
As well as peak current, the product information includes the stated engine limit, charging technology, connections and safety features. Be sure to check that these details match your vehicle.
8000A peak current according to the product information, 600-lumen light, USB-C 65W and USB-A outputs.
We’ve put together a complete, up-to-date list of products that meet these strict selection criteria and the applicable European safety regulations.
Yes, as long as the product specifications support diesel engines and your engine capacity is within the stated limit. Diesel engines often need more starting power than petrol engines. Also check that your vehicle has a suitable 12V lead-acid battery.
This varies depending on the battery type, model and storage conditions. Check the charge level regularly and recharge the device according to the instructions. Heat, long periods in storage and a completely flat internal battery can affect whether your car jump starter is ready when you need it.
Many models work as a jump starter with power bank. They have a USB port for phones, tablets or sat navs. Check the port type and output power. A model with an LED light can also provide emergency lighting, but always use your car jump starter for its intended purpose first: safely supporting a suitable 12V battery.
