A dead battery always picks the wrong moment. On a cold winter morning, in a remote parking lot, or just when you are in a rush. With a good jump starter, you can be back on the road in less than a minute, without jumper cables, without a second car, and without waiting for roadside assistance.
But which jump starter do you actually need? Prices range from €40 to over €300, and terms like peak current, cold cranking amps, and mAh capacity don't make the choice any easier. In this guide, we explain exactly what to look for, which model fits your car, and which features really make a difference.
In short: for an average passenger car with a petrol engine up to 2.0L, a jump starter with 400-800A peak current is sufficient. For diesels or larger engines, you need 1000A or more. Capacity (mAh) determines how many times you can start in succession: choose at least 10,000 mAh, preferably 18,000 mAh or higher.
What exactly is a jump starter?
A jump starter, also known as a booster pack, battery starter, or jump pack, is a portable lithium-ion battery that provides enough short-term power to start a car with a dead battery. You attach the two included cables to the positive and negative terminals of the car battery, press the start button, and can immediately start the engine.
The difference from traditional jumper cables: you don't need a second car. A modern jump starter weighs less than a kilo, fits in the glove compartment, and is ready for use in a few seconds.
Most of today's jump starters are multifunctional. In addition to starting, they also work as a power bank for your phone or laptop, have a built-in LED flashlight, and an SOS emergency light for roadside use. Some models even have an air compressor for inflating tires.
Do I even need a jump starter?
An honest answer: not everyone. But the people for whom it is an excellent investment usually fall into one of these groups:
- You drive short distances. A battery charges primarily during longer trips. Anyone who drives a lot in city traffic or leaves the car parked often will sooner or later deal with a dead battery, especially in winter.
- Your car is older than five years. The average lifespan of a car battery is around 4 to 7 years. A jump starter is cheaper than calling roadside assistance once.
- You frequently go on holiday, camping, or boating. You often leave boats, campers, motorcycles, and scooters standing for weeks, and that is precisely when the battery is dead the moment you want to leave.
- You don't have roadside assistance coverage or you live in a remote area.
- You value self-reliance. No waiting time, no phone without signal, no dependence on others.
The 5 things you need to look out for when buying
Not all jump starters are created equal. These are the five specs that really matter, in order of importance.
1. Peak current (amperage): must match your engine
This is by far the most important number on the packaging. Peak current (expressed in amperes, A) is the short burst of power the jump starter can deliver to your battery during ignition. A peak current that is too low simply means: the engine will not turn over.
Rules of thumb per engine type:
| Engine type | Engine capacity | Minimum peak current |
|---|---|---|
| Motorcycle / scooter | up to 1.0L | 200-400A |
| Small petrol passenger car | up to 1.6L | 400-600A |
| Average petrol passenger car | 1.6L-2.5L | 600-1000A |
| Large petrol car, SUV | 2.5L-4.0L | 1000-1500A |
| Diesel passenger car | up to 2.5L | 800-1200A |
| Large diesel, van | 2.5L-5.0L | 1500-2500A |
| Truck, boat, camper (diesel) | 5.0L-8.0L | 2500-4000A |
Diesels always require more peak current than petrol engines with the same capacity. The higher compression requires more power to crank the engine.
Note the difference between peak current and starting current. Many manufacturers advertise with peak current (short-term, often less than 2 seconds). The continuous starting current or cranking current is usually 3 to 5 times lower. For our Strex 12V Jump Starter 1000A, for example, that is 1000A peak and 300A continuous. Both figures are relevant: the peak current must be high enough for your engine, and the continuous current must remain high enough to crank the engine for a few seconds.
2. Capacity (mAh): determines how many times you can start
Capacity, expressed in milliampere-hours (mAh), tells you how much energy is in the jump starter. The more capacity, the more often you can start on a single charge, and the longer you can use it as a power bank.
| Capacity | Number of start attempts | Power bank usage |
|---|---|---|
| 8,000-10,000 mAh | 8-12 times | Charge phone ~2x |
| 12,000-16,000 mAh | 15-20 times | Charge phone ~3-4x |
| 18,000-20,000 mAh | 20-25 times | Charge phone ~5x, laptop 1x |
| 24,000 mAh+ | 30+ times | Charge phone ~6x, laptop 2x |
For independent use, we recommend at least 18,000 mAh. This keeps it ready for use for weeks without recharging, and you can make multiple start attempts in an emergency situation before needing to recharge the jump starter itself.
3. Safety features: non-negotiable
A jump starter delivers hundreds of amperes for a short period. This is safe, if the device has the correct protections. Always check if the jump starter offers at least the following:- Reverse polarity protection. Prevents damage if you connect the clamps the wrong way.
- Short-circuit protection. Stops automatically if the plus and minus clamps make contact.
- Spark protection. Prevents sparks when connecting, which is important because weak batteries can release flammable gases.
- Overheating protection. Switches off the jump starter if it becomes too hot.
- Overcharge protection. Protects the internal battery against damage during charging.
Quality jump starters combine all these functions into a multi-safety system. With Strex models, this is called an 8- to 10-fold protection system. Never buy a jump starter without these basic protections, regardless of how attractive the price is.
4. Operating temperature: underestimated in winter breakdowns
A dead battery occurs more often in cold weather than in warm weather. It is therefore important that your jump starter also works at sub-zero temperatures. Good models work reliably from -20°C to 60°C or even 80°C. Cheap models often lose significant power below 0°C, exactly when you need them most.
5. Extra features: what adds value?
The following features are not luxury, but convenience, and usually cost little extra:
- Power bank function with USB-A and USB-C. Makes the jump starter useful for everyday use.
- LED flashlight with SOS mode. Indispensable for breakdowns in the dark.
- Laptop output (16V/19V). For those who want to work on the road.
- Built-in air compressor. Especially handy if you often deal with low tire pressure or regularly go on the road with a trailer or bike.
- LCD display. Shows remaining capacity and "ready to start" status.
- Storage case or bag. Keeps the jump starter and cables neatly in one place in your car.
Which Strex jump starter suits you?
Strex currently offers two jump starter models. The comparison below helps you choose.
| Specification | Strex 1000A · 4-in-1 | Strex 4000A · 5-in-1 with compressor |
|---|---|---|
| Peak current | 1000A | 4000A |
| Continuous starting current | 300A | Higher (for heavy engines) |
| Capacity | 18,000 mAh | 24,000 mAh |
| Suitable for petrol | up to 6.5L | up to 10L |
| Suitable for diesel | up to 5L | up to 8L |
| Compressor | - | Yes, up to 10.3 bar |
| Power bank ports | 2x USB + laptop output | Multi-port + USB |
| LED flashlight | 48 hours on 1 charge | Yes, with SOS |
| SOS emergency light | 72 hours | Yes |
| Protections | Multi-safety | 10-fold protection system |
| Operating temperature | -20°C to 80°C | -20°C to 80°C |
| Included | Storage case, jump cables, car adapter, 4-in-1 USB cable, laptop cable with 8 connectors | Hardcover storage bag with all accessories |
| Price | €79.99 | €99.99 |
Which one should I choose?
Choose the 1000A version if you:
- Drive a standard passenger car (petrol up to 2.5L or diesel up to 2.0L)
- Mainly want to cover emergencies, not for professional use
- Are looking for a light, compact jump starter that can always stay in the car
- Do not need the compressor
Choose the 4000A version with compressor if you:
- Have a larger petrol engine, diesel, SUV, van, camper, or boat
- Also struggle with tires that regularly go flat
- Drive under extreme conditions (winter, long trips, off-road)
- Want one device for all breakdown scenarios: battery and tires
For most car owners, the 1000A version is sufficient. You need the 4000A version if you have a significantly larger engine or want a built-in compressor.
View all Strex jump starters →
How do you use a jump starter? Step by step
Using it is easier than many people think. Follow these steps:
- Turn everything in the car off. Lights, radio, air conditioning: switch them off. Key in "off" position.
- Open the hood. Identify the battery, usually a rectangular block with two terminals, found at the front left or right.
- Connect the red clamp to the positive terminal (+). This is often marked with a red cap or a plus sign.
- Connect the black clamp to the negative terminal (-) or to an unpainted metal part of the chassis (ground point). The negative terminal is marked with a minus sign.
- Turn on the jump starter by pressing the power button. Wait for the green light or confirmation on the display.
- Start the car. Turn the key or press start. If the engine doesn't start immediately, wait 30 seconds and try again. Never try to start for longer than 3 seconds at a time.
- Disconnect the clamps in reverse order: first black (-), then red (+).
- Let the engine run for at least 20 to 30 minutes so that the car battery can recharge. A short five-minute trip is usually not enough.
Important: if the engine doesn't start within 3 attempts, stop. The battery may be too damaged to hold a charge, or there may be another problem (alternator, starter). Forcing it can damage both your car and the jump starter.
Maintenance: how to keep your jump starter usable for years
A lithium-ion battery loses capacity if left fully depleted or fully charged for long periods. A few simple habits significantly extend its lifespan:
- Recharge the jump starter every 3 months, even if you haven't used it.
- Do not store it permanently in the sun or in extreme cold. For storage, the trunk is often fine; summer heat behind the windshield is not.
- Keep the terminals clean. A cloth with a little contact spray prevents corrosion.
- Test it occasionally. Press the power button briefly once a quarter to check if there is still capacity.
With proper maintenance, a quality jump starter lasts 5 to 7 years, just as long as the car battery it replaces or saves.
Frequently Asked Questions
How many amperes does a jump starter need to deliver for a normal car?
For an average passenger car (petrol up to 2.5L), a peak current of 600 to 1000A is more than sufficient. For a diesel, calculate 30 to 50% higher: at least 800 to 1200A. The Strex 1000A version covers 95% of passenger cars.
What is the difference between peak current and CCA?
Peak current is a marketing term chosen by the manufacturer, often the highest number the device can deliver briefly (1 to 3 seconds). CCA (Cold Cranking Amps) is a standardized measurement method at -18°C and is always lower. Not all jump starter manufacturers specify CCA. Therefore, compare peak current with peak current between models, not peak current with CCA.
Can I also use a jump starter for my motorcycle or boat?
Yes, provided the vehicle has a 12V battery. Most motorcycles, scooters, sloops, and small boats use 12V, which every standard jump starter works on. For 24V systems (trucks, larger boats), you need a special 12V/24V jump starter.
Can a jump starter damage my car?
A quality jump starter with polarity and short-circuit protection is safe. Damage almost always occurs due to improper use: starting for too long in succession, connecting clamps incorrectly on a device without protection, or forcing it when there is a deeper underlying problem. Follow the steps in this guide and you run no risk.
How long does a jump starter last?
With normal use and proper maintenance, 5 to 7 years. The lithium-ion battery inside gradually loses capacity; after about 500 full charge cycles, you will notice that the jump starter can start fewer times on a single charge.
Can I take a jump starter on an airplane?
Jump starters up to 27,000 mAh / 100 Wh are often allowed in carry-on luggage (depending on the airline), but never in checked luggage. Above 100 Wh, an exemption is usually required. Always check your airline's rules in advance.
Do I still need jumper cables if I have a jump starter?
No. A jump starter completely replaces classic jumper cables and has the major advantage that you don't need a second car. Many people keep both for certainty, but it is not strictly necessary.
Does a jump starter work with a completely dead battery?
In most cases yes, but not always. If the battery voltage has dropped below approximately 3V (very deep discharge), even a powerful jump starter sometimes cannot get through. In that case, an external battery charger (such as a trickle charger) is a better first step, as it slowly charges the battery to a level where it responds again.
What is the difference between a jump starter and a battery charger?
- A jump starter delivers a short burst of high current to start the engine immediately, in seconds.
- A battery charger slowly charges the battery over several hours while the car is stationary.
For emergencies on the road, you want a jump starter; for maintaining a battery in a stored car, motorcycle, or boat, you want a battery charger. Many Strex customers have both. Also check out our battery charger range for chargers with trickle and repair modes.
Ready to choose?
For most Dutch car owners, the Strex 1000A 4-in-1 jump starter is the most logical starting point: powerful enough for petrol cars up to 6.5L and diesels up to 5L, with 20+ jump start attempts per charge and all the commonly used power bank features. If you have a larger engine or also want a compressor for tires, go for the 4000A 5-in-1 version with compressor.
Both come with a 2-year Strex warranty, free shipping in the Netherlands and Belgium, and a 60-day reflection period.