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A dead battery always seems to happen at the worst time: a cold morning, a parking garage, or the airport lot after a long trip. A portable jump starter lets you restart the car yourself in a few minutes, without flagging down a stranger or finding a second vehicle and a set of cables.
This guide explains what to look for and compares three popular jump starters sold on Amazon. We have not lab-tested them, so the notes below come from the listing specifications and common buyer needs. Prices and reviews change often, so check the current listing before you buy.
Quick answer
- Most drivers with a car or small SUV: the NOCO Boost Plus GB40 is a compact, well-known option listed for gasoline engines up to 6 liters and diesel up to 3 liters.
- Trucks, large SUVs and diesels: step up to a higher-output unit such as the NOCO Boost GB70 (listed at 2000 amps).
- Maximum rated power on a budget-minded listing: the GOOLOO GP4000 is listed at 4000 peak amps.
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What to Look for in a Portable Jump Starter
- Engine size: Bigger engines, and diesels in particular, need more starting power. Match the unit to your engine, not to the biggest number on the box. Makers usually list the largest gasoline and diesel engine each model is intended for.
- Peak amps vs. real-world use: Peak amps is a marketing number measured under ideal conditions. Use it to compare models from the same brand, and put more weight on the engine sizes in the listing.
- Safety protection: Look for reverse-polarity, short-circuit and overheat protection. These matter if you are jump starting in the dark or in a hurry.
- Battery type: Lithium units are small enough to keep in a glove box or under a seat. Older lead-acid boxes are heavier but can be a fit for a garage.
- Extras: USB ports to charge a phone and a built-in flashlight are useful during a breakdown. Some models add an air compressor, which is convenient but makes the unit larger.
- Temperature range: Lithium batteries lose output in extreme cold and should not be stored in a hot car for long. Check the operating and storage range in the manual.
The Best Jump Starters on Amazon
Best for Most Cars
NOCO Boost Plus GB40 1000A Jump Starter
Best for: cars, crossovers and small SUVs
The GB40 is listed as a 12-volt, 1000-amp lithium jump starter with built-in safety protection, rated for gasoline engines up to 6 liters and diesel engines up to 3 liters. It is compact enough to store in the cabin and also works as a USB power bank.
- ✅ Pros: Small size, recognizable brand, safety features, USB output
- ⚠️ Keep in mind: It is not the pick for large diesel trucks, and you still need to keep it charged
Best for Trucks and Big Engines
NOCO Boost HD GB70 2000A Jump Starter
Best for: pickups, large SUVs and vehicles with bigger engines
The GB70 sits above the GB40 in the same family and is listed at 2000 amps. That extra headroom is useful for larger gasoline and diesel engines and for cold-weather starts.
- ✅ Pros: More output than the GB40, same style of protection and clamps
- ⚠️ Keep in mind: Larger and heavier than the GB40, and it costs more
Highest Listed Peak Amps
GOOLOO GP4000 4000A Peak Jump Starter
Best for: drivers who want a high rated output and a power bank in one box
The GP4000 is listed at 4000 peak amps with a large-capacity battery, and the listing says it can start large engines. As noted above, treat peak amps as a comparison number, and read the engine sizes in the listing.
- ✅ Pros: High rated output, power bank function, popular with buyers
- ⚠️ Keep in mind: Peak numbers are not directly comparable across brands, so read reviews from owners with a similar vehicle
If you also want a built-in tire pump, you can browse jump starters with an air compressor on Amazon. See also our guide to the best portable tire inflators if you only need the pump.
How to Jump Start a Car With a Portable Jump Starter
- Turn off the engine, lights and accessories. Read the manual for your jump starter and your car.
- Make sure the jump starter is charged and switched off before you connect it.
- Connect the red clamp to the positive (+) battery terminal, then the black clamp to the negative (-) terminal or to an unpainted metal ground point if your manual says so.
- Turn the jump starter on, wait for its ready indicator, and start the car.
- Once the engine is running, switch the unit off and remove the clamps in reverse order: black first, then red.
- Let the car run, or drive it, so the alternator can recharge the battery.
When a Jump Start Is Not the Real Fix
A jump start gets you moving, but it does not tell you why the car would not start. If the car needs a jump more than once, or the battery is several years old, the battery may simply be at the end of its life. Our guide to car battery replacement cost explains what a new battery usually involves. A failing starter or a charging problem can look similar, so see symptoms of a bad starter if the engine only clicks or cranks slowly after a successful jump.
Keeping Your Jump Starter Ready
- Recharge it every few months, and after each use, because lithium units slowly lose charge in storage.
- Keep it out of extreme heat, such as a closed car in summer.
- Check that the clamps and cable are not cracked or corroded.
- Keep the manual somewhere you can find it in an emergency.
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How many amps do I need to jump start a car?
It depends on the engine. Small gasoline engines need far less than large diesels. Check the largest gasoline and diesel engine size each jump starter lists, and choose one with some margin above your engine.
Can a jump starter damage my car’s electronics?
Models with reverse-polarity and surge protection are designed to reduce that risk, but always follow the connection steps in your manuals. If your car is a hybrid or EV, check the owner’s manual first, because the 12-volt jump procedure can differ.
How long does a portable jump starter last?
The unit can last for years if you keep it charged and avoid heat, but the battery inside slowly ages. Replace it if it no longer holds a charge or shows damage.
Is a jump starter better than jumper cables?
A jump starter works alone, so you do not need a second car. Cables are cheap and have no battery to keep charged, but they need another vehicle nearby.
This article is general information, not professional mechanical advice. Follow your vehicle manual and the instructions that come with your jump starter.