Top 15 Best Jump Starters — Review and Buyer’s Guide



Jumpstarters are one of those essential tools that many drivers don’t really think about. It might sit around in your trunk until you forget it exists, but if your car ever breaks down, it’s a priceless lifesaver. If road trips are a familiar activity to you, or even if you’re a “better safe than sorry” type of person, a jump starter is an investment you should consider.

car stoped

Technical Terms

You’ll find a lot of technical terms in this review, so let’s get those out of the way first. The most commonly-found term is probably amperes, or it goes simply A. For example, a product described as “800A Peak” means that the maximum current that can flow through the jump starter is 800 amperes. Simply put, it’s the measure for current. Similarly, ampere-hours or Ah (mAh for milli-ampere-hours) is the description of the charge the item can output. So, a 18000mAh device would charge your phone faster than an 8000mAh alternative (usually).

Voltage (mostly denoted in this article via “12V”) is the measure of electric potential—to put it simply. It’s basically the “wave” that the current flows in; for conventional vehicles, a 12V direct current is a standard, so you’ll see most jump starters the following suit. Think of the overall relationship as a water pipe—the water pressure is the voltage, and the total volume of water flowing would be the amps. As such, the wattage (power output of the water/current) increases as you get more amps flowing.

If you’d like a more detailed explanation of jump starters to work, you can find plenty of literature online that would help you understand the terminology in this review fully. Otherwise, the above summary should be enough to paint a picture of how these products compare.

Jump starters short overview

Before we dive into the individual items on our list, let’s take a closer look at what separates those different jump starters on the market. Whether you’re looking for a portable one or the most powerful one available, you are bound to find your car jump starter below.

GOOLOO Upgraded Car Jump Starter 1000A
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The Gooloo item is one sleek-looking jump starter. Like many of these products, it is both a jump starter and a power bank that adds to its everyday functionality. It is a simple yet reliable jump starter that conquers any issue you might face on the road with ease.

Functionality Overview

Overall, this jump starter boasts the perfect balance between power and user-friendliness. Clocking in at 1000 peak amps, it is strong enough to start most 12V cars. Specifically, it is designed to jump start up to 7-liter gas or 5.5-liter diesel engines. It doesn’t stop there, though; it can start any 6V or 8V as well, with the list of applications ranging from snowmobiles to boats. 

As for the watt-hours, it comes in at a 66.6Wh (no, I didn’t make this number up). The input capacity is 15V/1A, and the discharge temperature is anywhere between -4°F and 104°F. The charge temperature is between 32°F and 113°C, ensuring it doesn’t get too hot when in use. 

Lightweight and Portable

Perhaps the main appeal of this product to the average driver is its lightweight setup. It is only about 6 inches by 2 inches, making it just slightly bigger than the iPhone X. As such, the fact that it’s portable isn’t too crazy an assumption to make. Don’t let its size fool you though, as it can hold its charge for months and can last over 20 jump starts on one charge. Overall, there is little consideration required if you’re looking for a jump starter that is portable but powerful. 

Versatile and Powerful

The main feature of this product is its universal usability. Even if it sits in your trunk for months with no jump starts under its belt, it can still see daily use in the form of a quick-charge device; if your car doesn’t boast a USB port, this is a must-have in the cabin. The port is also—you guessed it—universal, and offers a quicker charge than typical methods. It also comes with an LED flashlight for work in the nighttime. One full charge takes you just 5 hours and will hold for months on end. There isn’t even a need to mention its jump starting capabilities; it’s solid and reliable across the board.

• Durable construction
• Convenient and portable
• Slick design
• Holds charge for months
• Temperature control
• No major downsides
NOCO Boost Plus GB40 jump starter
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The NOCO brand of jump starters is fairly popular on the market, and for good reason. The GB40 line boasts a solid product in the form of Amazon’s choice, the Boost Plus. It is neck-and-neck with the GOOLOO in terms of function and form.

Functionality Overview

Much like the GOOLOO, the NOCO GB40 offers a peak amp of 1000 and works with 12V vehicles. It does, however, concede to the former by way of versatility; it is suited for up to 6L Gas and 3L Diesel engines. It does have an impressive battery life, though, offering 20 jump starts on a single full charge. Similarly, you can use it for up to 6 hours uninterrupted. It also comes with an LED flashlight, which has seven different settings, ranging from a standard beam to an emergency SOS strobe.

Consistently Solid

From Subarus to minivans and small boats, the NOCO Boost Plus comes through for buyers again and again. Despite being so lightweight, this jumpstarter is both versatile and reliable. Though the manufacturer states that your car battery can not be entirely dead when using the jumpstarter, many have had success getting their engines started with it despite completely dead batteries, particularly when using the manual override mode (which should be done with extreme caution, mind you). If you are worried about a long road trip or perhaps your battery is old, the NOCO Boost Plus will restart your vehicle time after time without hassle. 

• Up to 6 hours of uninterrupted use
• Seven flashlight settings
• Versatile and reliable
• Can jumpstart dead batteries
• Not suited for 7L Gas engines
Clore Automotive JNC550A 1100 Peak Amp starter
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Our first entry above peak 1000A, the Clore Automotive is not to be underestimated. It is an all-in-one solution for those in need of a long-lasting and versatile jump starter. 

Functionality Overview

Offering heavy-duty reliability, this product’s list of applications is long. It comes with multiple sturdy 34” cables and, like the others, has a USB port and LED light. On top of that, it can be used to remedy flat tires in a pinch with the air hose and compressor. Despite its size, it is also easy to stow thanks to the storage holsters. Finally, as the name might suggest, it offers 1100 peak amps and is equipped with a 12V outlet. Finally, the LED display lets you know the status of the internal battery.

Pricey Tank

The JNC550A jump starter has one major downside: its price tag. It is definitely not the cheapest on our list, due mostly to its hefty build, high-quality manufacturing, and versatile functionality. Aspects like extra long and durable cables and a long-lasting charge ramp up the cost of this jump starter to the point where it is one of the most expensive on our list. It goes without saying that you pay for quality, and this jump starter certainly fits the bill. A unit of this grade and price would be more suited for someone in need of a jump starter frequently, such as tractor and boat owners, versus someone looking for a lightweight backup unit in case of roadside emergencies.  

Quality Lifetime and Durability

If you buy this jump starter, you will have a device to start your vehicle for years to come. Not only is it “strong enough to start up a dead horse,” as one user eloquently described, but many have also found their starter to maintain this power for several years no matter how frequently they used it. It shouldn’t come as a surprise considering that the JNC550A was designed to provide jump-starts numerous times over extended periods of time, but it is still an impressive aspect. Thanks to its long-lasting reliability, the majority of buyers state that this jump starter is well worth its heavier price tag, so if you have an extra dime to spare to ensure a top-notch purchase, this may be the jump starter you are looking for.

• Durable construction
• Includes a variety of accessories and features
• Longevity and reliability
• Big in comparison
• Pricey
GOOLOO 800A Peak 18000mAh SuperSafe starter portable
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The milder version of the first GOOLOO product in our list also makes it in at #4. It is slightly more reserved in its power, offering 800 peak amps. However, it is built with safety and user-friendliness in mind.

Functionality Overview

Much like its counterpart, this item is very slick and compact. It weighs just over a pound and is about the same size as the other GOOLOO. This jump starter and power bank hybrid offer much of the same technical aspects as its sister product, with a USB and 12V DC outlets and flexible LED flashlight. Similarly, it is suited for most 7L Gas and 5.5L Diesel engines. Overall, the only major difference is its peak amp; for a casual user, this aspect wouldn’t change much.

Store it Anywhere

This jump starter and charger really take the term “portable” to another level. Despite being able to start large trailers and trucks, this unit is barely over a pound in weight and is one of the smallest jump starters on our list. Its compact size allows you to store it almost anywhere in your car, even in your glove box, which cannot be said about other more heavy-duty jump starters. If you have space in your vehicle for your favorite book, you have space to store the GOOLOO jump starter.

Reliable and Easy

Besides its conveniently small size, this unit also has features that make it perfect for those in need of an emergency jump starter who are not exactly vehicle enthusiasts. The jump starter has a green light that illuminates to let you know whether or not you have applied the cables correctly to your vehicle, perfect for someone who is not particularly a handyman by nature. Users report that this jump starter is not only more convenient to carry than cables, but setting it up is a lot more intuitive as well. In addition to being easy to use, the GOOLOO jump starter reportedly does not drain its own charge significantly when jump-starting vehicles or charging devices, making it the perfect car companion for emergencies.  

• Durable construction
• Convenient and portable
• Slick design
• Impressive applicability for its amperage
• Rare occasion of battery defects (heating up
significantly while charging)
TACKLIFE T8 800A Peak 18000mAh jump starter
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Another 800A product, the TACKLIFE is no pushover, either. An eye-catching uniqueness of this jump starter is the all-metal ergonomic design that gives it a slick appearance. It is yet another highly versatile jump starter to add to your shopping list.

Functionality Overview

WIth its 800A peak current, this item can jump-start most 12V vehicles. The battery fully charges in just 4.5 hours and can last for up to 30 uses. Thanks to its on/off switch function, it can slow down self-discharge and can hold a charge for up to a year if not used. Much like the others, it boasts an LED flashlight with several modes, such as the SOS signal. There are a few features that set it apart, though, with a 15V outlet and cigarette lighter adapter to accompany the two standard USB ports. The compass is just the icing on the cake.

Better Safe Than Sorry

With its safety-first approach, this jump starter is perfect for those that value the longevity of their products above all. It comes with several features that help you use it correctly and effectively; specifically, if it is being used improperly, it will set off flashing lights and buzz. It’s also backed up by a 2-year warranty and around-the-clock customer service. Basically, TACKLIFE makes sure you have the best and most long-lasting experience possible. 

All-Inclusive Design

Once again, the design of this jump starter is considerate and extensive. From the safety features to the multitude of user-friendly design points, it’s a fantastic purchase for anyone looking for a jump starter. Users regularly noted that they didn’t expect much from this product, and it blew them away with its fast and easy jump-starting capability. The flashlight isn’t just a neat feature, either; the light is very bright and makes working at night as easy as during the day. Overall, all of its features add layers of utility and aren’t just for show. 

• Safety features
• Multiple design features
• User-friendly
• Includes cigarette lighter adapter
• No major downsides
GOOLOO 1500A Peak SuperSafe starter
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Yet another GOOLOO entry, the 1500A SuperSafe model is the strongest of the bunch. However, it’s once again not too different from the other SuperSafe products and puts an emphasis on easy-to-use design and solid performance. 

Functionality Overview

While design-wise it’s similar to the other GOOLOOs, specifically in its slick minimalistic look, it packs a bit more of a punch—both in price and power. The 1500A version is suitable for up to 8L Gas and 6L Diesel engines, putting it above the jump starters we reviewed so far. However, in most technical aspects (like battery life) it is consistent with the line of SuperSafe GOOLOOs.

GOOLOO’s Strongest

There’s not much to say about this product that hasn’t been said about the other GOOLOOs. It’s cheaper than an insurance policy and can easily get you out of a breakdown in minutes. Even boat engines are no liability to this powerhouse at your side. Some complaints, however, were aimed at the short cable lengths; with leads of just 3 inches, it might not be suited for vehicles with terminals farther than that from the engine. 

Very Practical

Practical is this product’s middle name. It can be stored anywhere and jump-start more types of engines than most other jump starters on the market. Of course, it can also be used as a power bank, so it doesn’t just sit in your trunk for months; however, some users noted that the battery gets really hot while charging, which is most likely a sign of a defective unit. All in all, this is the product you’re looking for if you need a professional jump starter that is still convenient to store and use.

• Strong amperage
• Durable construction
• Convenient and portable
• Slick design
• Short cable leads
BEATIT QDSP 800A Peak 12V  jump starters
Buy on Amazon

Another handheld jump starter, the BEATIT QDSP is fairly similar to the GOOLOO line in make and general look. It is one of the more affordable ones in our list, which might make it more appealing to casual users.

Functionality Overview

At 800 peak amps, it’s fair to say this jump starter is a middle-of-the-road choice. It is suitable for up to 7.2L Gas and 5.5L Diesel engines and comes with an integrated voltmeter that lets you monitor your battery. As with many others, it comes with an LED light with several settings for emergency situations and nighttime work. As is normal, it is designed for 12V vehicles. One downside, though, is that the amp-hours comes up to 12.8, compared to the standard of 18 across this list.

Middle of the Road

Like we’ve said, this item is a mid-range choice. It’ll do its job of jump-starting your car with no hassle and even comes with some user-friendly issues. However, many have noted that the flashlight is difficult to figure out (admittedly, the instructions BEATIT gives are fairly convoluted). However, with 2 USB ports and portable design, it makes for a great investment. All in all, it’s a solid choice for its price and is perfect for anyone looking so save some money on a decent product.

• Decent option and relatively affordable
• Portable
• Wide engine applicability
• Integrated voltmeter
• Confusing flashlight directions

8. Ultra Compact DBPOWER 300A Peak — Budget Option

With even more budget-friendliness than the BEATIT, the DBPOWER model is certainly eye-catching—for both good and bad reasons. It’s perhaps what you would expect for a third of the price of some of the hard-hitters on this list.

Functionality Overview

The design is simple and straightforward—it has 4 battery life readings for every 25% increment and has a flashlight feature with 3 modes. It is ONLY suited for gas engines, capping out at 2.5L, its 300A peak current reflecting the fact. In terms of charge, though, it’s not too bad; 8000mAh is more comparable to the standard 18000 if we’re talking about charging devices on the road.

Entry-Level Option

If you are an owner of a vehicle with a 2.5L or less gas engine, it’s certainly worth taking a look at this jump starter. The amperage of this unit certainly leaves a lot to be desired, but for the price, it’s a steal. Buyers are generally very pleased with the design and functionality of the jump starter, and it rivals regular portable charges in price. It’s a neat little tool that will start the most unsalvageable batteries, even with its lower strength.

• Very affordable
• Minimalistic design
• Good value in functionality
• Weakest of the lot
• Weaker charge capability
DBPOWER 600A Peak Portable Jump Starter
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If DBPower’s previous choice was intriguing to you, you might want to take a look at the 600A model. It’s a lot more fleshed-out and versatile than its 300A counterpart, and will certainly turn heads with its design.

Functionality Overview

This product not only offers twice the current of the other DBPower, but it also boasts 18000mAh in a convenient and portable package. Suited to up to 6.5L Gas and 5.2L Diesel engines, it even rivals the higher-amperage products here. It has 4 ports total; input, output, smart USB, and regular USB. The smart USB is designed to intelligently recognize the device you plugin such that it charges at the maximum possible speed by cycling between 12V, 16V, and 19V. 

Deceptively Powerful

Slapping a 600A on this product doesn’t do it justice; it can compete with the GOOLOO line in both versatility and overall utility. It will jump-start your car in seconds and can stay in your glove box until it’s needed again. Everything about this item has purpose and user-friendliness in mind. On the rarest of occasions, though, buyers had problems with its longevity. One user even had theirs explode during one use; whether the engine was incompatible wasn’t clarified. Either way, it’s a rarity, and even in cases where it has happened, the jump starter had been used heavily beforehand.

• Smart charging USB
• Wide suitability for its price and power
• Only 600A peak
• Potential defective product
Imazing Car Jump Starter 1000A Peak
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The Imazing jump starter is, much like many other options on our list, a jack of all trades. It has safety features, is easy to use, and is fairly lightweight. There isn’t much setting it apart from its competitors, however.

Functionality Overview

At 1000 peak amps and suitability for up to 7L Gas and 5.5L Diesel engines, this item is comparable to the standards set out by GOOLOO products. Overall, it does much of the same; 12V output accompanied by 3 USB ports (1 being USB-C) allows for quick charging at any moment. It is good for 30 jump starts, which is a decent figure. An LED flashlight and LCD display for battery monitoring round out the features.

Safe and Slick

Beneath the slick look of the product is a lot to uncover. Firstly, the way the jump starter works is by giving two beeps as an “ok” signal once you’ve connected the leads to the car. Once you hear those beeps, it means the car battery jump starter is good to go, and that you can start up the engine. This feature surely makes this the right jump starter for the more unsavvy users. If you’re all good on the road, the power bank is sure to charge your devices up to three times as fast as a regular outlet. One potential downside, though, is unclear advertising; it might not be fit for a 7L engine, especially cars without 4 or 6 cylinder motors. 

• User-friendly use
• 3 USB ports with quick charge
• Lightweight
• Double check engine fit
MOOCK Car Jump Starter, 1500A Peak
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The size of the MOOCK starter might throw you off when you find out that it hits a whopping 1500 peak amperes. At a slightly costlier price (understandably), this product has perks that more than makeup for it.

Functionality Overview

As you might expect from a heftier product, it can start up even 8L Gas and 6L Diesel engines. It is practically suitable for anything; motorcycles, boats, you name it. Interestingly, it is also the first product that breaks the 18000mAh barrier, clocking in at a 20800mAh charge. The clamps boast of protective technology that prevents overload in any form, and even protects from any temperature-related changes. It goes without saying that it has a multi-functional LED light as well.

Everything You Need

From safety to power, this jump starter has everything you really need. It’s impressive enough to have such power inverter technology in such a light device (weighing only 1.4 pounds). The reliability of this product takes it to another level, though. Testimonies from buyers typically describe that it comes almost fully charged (75% was the most common number) and takes very little time to charge fully. Everything about this product is smart and safe, which earns its place on our list.

• 1500 peak amperage
• Great charge capability
• Protective technology
• Comes charged
• Versatile in applications
• No major downsides
Flylinktech Portable Car Jump Starter 1500A Peak
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Another 1500A item, this one is perhaps just as impressive. It manages to cram power and convenience in an even lighter package than the MOOCK. Everything about this model screams user-friendliness and an easy jump-starting experience.

Functionality Overview

The Flylinktech portable jump starter is a truly powerful unit – it can start vehicles with engines as large as a 7L diesel engine, and takes less than a second to do so. Compared to the several attempts and seconds most jump starters take to successfully start a dead vehicle, this is a very impressive feat. The jump starter also comes with a powerful LED flashlight for emergency use, which has 3 different modes according to the user’s need, including a strobe setting. All of these robust features are packed into a jump starter that weighs only 1.2 pounds, an accomplishment of design that is noteworthy enough to put the Flylinktech jump starter on our list.  

User-Friendly Design

In addition to being powerful, this jump starter is also very conveniently designed. You do not have to be a car junky to figure out how to use the Flylinktech portable jump starter. In fact, in the case that you do not set up the cables properly when attempting to jump your vehicle, the unit includes features that prevent over-current, short-circuit, overload, over-voltage and over-charge, reverse polarity, and reverse connection. Its intuitive design means that you will be able to take full advantage of all of the Flylinktech jump starter’s features easily and quickly, from charging your phone to jump-starting your vehicle.  

• User-friendly
• High amperage and quick charging
• Very lightweight
• Intuitive design
• Complaints of charging defects
Rugged Geek RG1000 Safety GEN2 1000A
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The Rugged Geek jump starter is made with quality in mind. It is the only jump starter on the market using intelliboost technology, that only powers the jump starter if it is safe to do so, preventing damage and potential danger in the process.

Functionality Overview

The unit includes a high discharge lithium battery of exceptional construction to ensure its safety and performance. With the quality construction fitting in the palm of your hands, the Rugged Geek RG1000 can charge almost any vehicle in seconds. It offers 1000 peak amps and is designed to jump start most passenger vehicles with 7L Gas or 3.5L Diesel engines. The battery can last for up to 20 jump starts on a single full charge as well.

Durable and Handy

This “rugged” aspect of this unit’s name is very fitting. The small and lightweight jump starter comes with a hard carrying case, ensuring that your starter will not break if it gets knocked around in your car. Unlike most jump starters, the Rugged Geek RG1000 can fit in the palm of your hand – if you have space in your glove box for your smartphone, storing this starter will be no issue for you. This combination of being durable and convenient makes it the perfect companion for long car rides or any situations you may need an emergency jump start. Additionally, the unit comes with two USB cables and a laptop port to charge any of your devices, making it a truly handy companion. 

• Sufficient charging ports
• Intelliboost technology
• Small and portable
• Not suited to larger diesel engines
WEEGO 66.1 Jump Starting Power Pack
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Functionality Overview

This American-made jump starter can stay charged for two years, yet takes a mere 3 hours to charge. Don’t scratch your eyes, this power pack promises 2500 peak amps, accompanied by 600 cranking amps. This sets it apart as having the highest current output on our list by far. The jump starter manufacturers even state that it works on any vehicle, but is suited for jobs with larger gas and smaller diesel engines. Overall, it has the most impressive functionality on this list.

Premium Option

The WEEGO 66.1 jump starter comes with a hefty price tag, but for good reason. Its sleek design is complemented by its impressive power and durability. Additionally, the company ensures an 18-month warranty on the unit accompanied by exceptional customer service. Its patented clamps provide extra safety measures, allowing you to avoid setting up the jump starter improperly and preventing any potential damage. Considering all of these useful features, it is no wonder why WEEGO’s jump starter is considered a high-end option.  

Lightweight Yet Intricate

The jump starter is both small and extremely practical in design. Despite being only 2 pounds and as large as a flashlight, the WEEGO 66.1 is full of surprisingly useful and intricate details. This multifunctional unit serves as a jump starter, a flashlight, and a power bank. No matter where you are if you have this jumpstarter nearby, you can charge your devices such as phones or tablets, plug in other useful tools like tire pumps, and start a multitude of vehicles from ATVs to boats. This all-in-one construction of the WEEGO jump starter makes it a fierce contender on our list of best jump starters on the market.   

• Very high amperage
• High crank amps
• Durable construction
• 18-month warranty
• High volume of complaints regarding defective products
SDSPEED High Capacity Car Jump Starter
Buy on Amazon

Our final entrant is the SDSpeed model, and it’s a good one to round it off with. At 800 peak amps and 4 USB ports, it’s one of the more universal items. It offers great value even if you never have to jump start anything.

Works Out of the Box

The SDSPEED jump starter comes charged and ready to go, meaning you could take it straight out of the box and use it immediately. It charges quickly, ready to jump-start completely dead car batteries within an hour of charging. Not only can it jump-start your vehicle – from small sedans to 3L diesel engines – straight out of the box, it can do so 20 times within one charge. This ready-to-go feature of the unit makes it a competitive offer on our list. Its other features make the product as compelling as the actual jump starter device. 

Affordable and User-Friendly

Another competitive aspect of SDSPEED’s jump starter is the fact that considering its power, convenient size, and high-quality design, it is also quite affordable. Korean-made and featuring a top-notch polymer battery, this unit is built to last through multiple uses in the toughest environments. On that note, the SDSPEED jump starter comes with so many additional useful tools that the purchase is practically a survival kit for emergencies. Included with the unit is a LED flashlight, compass, safety knife, and emergency hammer. Additionally, the jump starter features a user-friendly LCD screen which displays remaining power levels and other useful information when hooking up the jump starter to your car. 

• Four USB ports
• Good battery life
• Emergency tools
• Suited to less types of engines
• Complaints about starting dead battery

Conclusion and Review

With all that said and done, it’s time to wrap it up. The benefit of jump starters cannot be overstated, as it’s an important insurance tool to have on hand. Even if you never use it, some of the features that come with the best vehicle jump starters are competitive on their own (quick charging, for example). 

Pretty much all of these jump starters come with jumper cables, and the functionality of many of these jump starters are aided with both safety measures and user-friendly features. Whether you’re looking for a heavy-duty item for your boat or a milder option for your sedan, this list will hopefully make buying a jump starter easier. 

The premium options include the Weego 66.1, which makes its name through sheer power, and the Clore Automotive model, which focuses more on sheer versatility. On the other hand, you have the more affordable “starter” models that still pack a punch; the BEATIT and DBPower options are still competitive despite their price.

The majority of products lie in these categories: slick, compact, durable, reliable. These describe so many of these jump starters—from the GOOLOOs to the Imazing—and for good reason. They are all good jump starters, and the design of the units is focused on convenience, portability, and durability. 

In the end, the choice is up to you; budget constraints or a safety-first attitude might make one or more of these products pop out at you, and hopefully, the jump starter you land on will last you for a lifetime.

Frequently Asked Questions

Q: How can I be sure that a jump starter is safe to use?

A: Always check the compatibility of your device with your vehicle. If you have a 6L Gas engine, for example, and the product is designed for up to 7L, chances are you’re safe to use it. Also look for any safety features, whether in the form of protection or automatic shutdown of operations. 

Q: Are there any advantages of a conventional jump starter over a battery pack/power source version?

A: To be frank, the dual pack/power models carry significant advantages. They are typically smaller, come with nice features (like LED lighting) and overall have more uses (such as to charge your devices). In terms of convenience, these kinds of jump starters can’t be beaten.

Q: Why does my jump starter not start a completely dead battery?

A: The secret is in the cranking amps of the item; typically you want around 500 cranking amps to be able to start a dead battery. Then again, you might just have an incompatible product; if, for example, the jump starters were designed for 4-cylinder cars and you have a 6-cylinder motor, that’s probably the answer.