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Breaking it Down – Vol. 1 Anatomy of a Jump Starter

In this new series, we take a look at what makes a specific product tick. In this case, we look at jump starters and how the specific parts of a jump starter work together to solve problems for technicians and vehicle owners. At Clore Automotive, we manufacture three separate brands of jump starters:  Booster PAC, Jump-N-Carry and CarStart. Each has specific features that differentiate them, but they share an array of components and performance drivers that are common among all jump starters.

The Heart of the Jump Starter

The battery is the most important contributor to jump starter performance. It impacts everything from the jump starter’s max boosting capacity, the number of jumps that can be performed per charge, the amount of time that the jump starter can sit between charges, its ability to withstand abuse and the overall service life of the unit.

Our ES Series (Booster PAC) and Clore PROFORMER (Jump-N-Carry) batteries are specifically developed to perform vehicle jump starting applications. They are designed to deliver exceptional power in a quick, concentrated burst. Numerous factors contribute to the power derived from the battery, including the number of lead plates contained, the physical composition of those lead plates, the specific construction of the battery cells, the purity of the electrolyte solution and more.

In our case, we utilize a high quantity of thin lead plates to increase total lead plate surface area, which increases the power of the battery. In addition, our plates contain few impurities, which can sap power and accelerate depletion of the jump starter between charges. Our battery cell construction features enhanced structure to better flow the power through the battery to the vehicle. The electrolytic paste in our batteries is a high quality composition that enables more efficient recombination for better discharging (jump starting) and recharging. All of these enhancements serve a single purpose: deliver the power you need, even in extreme conditions, over and over again.

Follow the Power Path

So, we’ve invested extensive research and development efforts into the battery itself, but that investment is diminished if we can’t get all of that energy to the vehicle. That’s where the Power Path components come into play. These consist primarily of the output cables and battery clamps.

Output cables must be sufficiently conductive to deliver the battery’s energy without introducing excessive resistance, which would result in a voltage drop, diminishing the jump starter’s capacity to start the vehicle. The more powerful the battery, the greater the requirement on the output cables. Our output cables are specifically mated to the battery capacity of each jump starter to ensure optimal results. They are extremely durable, flexible in cold temperatures and resistant to vehicle fluids and chemicals.

Like the output cables, battery clamps must facilitate an efficient transfer of power from the jump starter to the vehicle. This comes down to two factors: their conductive capability and their ability to create a proper physical connection to the vehicle, be that a battery post (positive cable) or the vehicle chassis (negative cable). Our jump starters feature industrial grade clamps with high tension springs to penetrate battery corrosion.

Many units feature our Hot Jaw clamps, which are wired on both sides of the clamp jaw, for maximum power transmission to the vehicle.

Recharge Convenience

Another aspect of importance comes when it is time to recharge your jump starter. How can this be done? When should it be done? How easy is it to accomplish this task? All of these issues are related and can impact the longevity of your jump starter. Most Clore Automotive jump starters feature automatic charging, which allows the unit to be connected to an AC power source indefinitely, without concern for overcharging the battery.

Designed for Jump Starting

It sounds redundant, but at Clore Automotive, our jump starters are designed for jump starting. There are competitive products around that perform more functions, whether through built-in radios or other ancillary features. Our focus is on repeatable, reliable, lasting power. Hundreds of discussions with professional technicians, tool dealers, counter staff and others have boiled down to one common theme: give me the power I need to get the job done! So, we have invested most in those aspects of the jump starter that support extreme power delivery, as noted above. When it absolutely has to start, you can rest assured that your Clore Automotive jump starter has what it takes to get the job done.

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  1. gary vitale says:

    i jump started my car but dashboard lights were not on door locks did not work as well as trunk lock and gas lock nothing inside the car was working as soon as i disconnected ground cable the car died instantly i did this numerous times and the same thing happens. once car is jumped does the charger charge my battery cause battery is only 3 monyhs old. what could be the problem. also had vew alternater replaced about 3 years ago. very frustrated

    • It is probably because your alternator is defective. It is like a small electric generator that charges your battery as the car engine runs so if it is not working even if your battery is new once you disconnect the jump starter, engine dies.

  2. Can this jumpstarter model JNC660 be used to fully charge my battery after jumping with connecting to an AC power source? How long will this takes to have>the battery fully charged?

    • Mr. Ling – thank you for your comment/question. The JNC660, and all of our jump starters, are designed to provide starting power to vehicle with a weakened or compromised battery. It is not designed to serve as a charger to bring a battery back to full charge from a depleted state. For that purpose, you are better suited to purchase a battery charger or charger/maintainer. Thank you, Jim from Clore Automotive

  3. Is the Internal battery lead acid or agm?

    • Jim – The batteries inside all of our portable jump starters are nonspillable, sealed lead acid AGM batteries. The jump starters can be stored and used in any orientation. Thanks, Jim from Clore Automotive

  4. The peak amperage is 1700 amps; what is the charging amperage?

    • gjn – The jump starter delivers 1700 peak amps and 425 cranking amps to immediately start a vehicle with a disabled battery. It does not provide a charging function to the battery, but it recharges at 1.2 amps when connected to an ac outlet via an extension cord. Thanks, Jim from Clore Automotive

  5. desertstarlover says:

    I would like to use either an ES5000 or a JNC660 as a jump starter for my van and also to keep in my house to run a couple of electric lights, when the local power goes out, (I have an inverter). I see the difference in the peak & cranking AMPs, cable length, etc., but other than that the ES5000 also not having an onboard inverter, what is the differences in these tow products?

  6. desertstarlover says:

    please delete my previous (awaiting moderation) comment. I found where I can ask a question and I did, thanks.

  7. What, exactly, is the male-to-male cigarette lighter adapter cable used for?

    Thank you.

    • Dave – the male-male 12V extension cord is used primarily to charge the unit from another DC power source, such as your vehicle’s power port. Care must be taken when charging a unit in this fashion, as they is no overcharge protection. That said, there are times when access to an AC wall outlet is not possible, so this provides a good alternative. Thanks, Jim from Clore Automotive

  8. “Just made a purchase with Jump N Carry 660 does this come with a 12V extension cord to charge the unit?”

    • Zuberi – Yes. Most of our portable jump starters include a Male-Male 12V Extension Cord. Each JNC660 comes with the 12V Male-Male cord. Thanks, Jim from Clore Automotive

  9. “Thank you Jim for the Speedy response!”

  10. Hi. I just bought your JNC60 unit. very impressed with the unit in general (quality in workmanship & construction)and I separately bought a quality extension cord to keep its internal battery topped off.

    Within these Q/A on this forum, can I keep my JNC660 unit petty much constantly plugged in to its AC port to keep it trickled charged and topped off? Or do I need to unplug it when indicated as to being fully charged?

    I intend to keep this unit at home and have there, ready to go, when the cold or just a worn out car battery causes me to store it there for “just in case.” Modern wore out car batteries “die” very quickly when used up. (Not sure where I am at in that stage now)

    Thank in advance for your answer!

    • Lee – Yes. The JNC660 can remain connected to AC power indefinitely without adverse consequences. In fact, we recommend doing so, if circumstances allow it. You are correct about modern batteries. They provided very little forewarning of an impending failure. Having a reliable jump starter can be a real godsend in these situations. Thanks, Jim from Clore Automotive

  11. The JNC660 is a great item. We use it with grave regularity and never have a problem. Are there replacement parts available? Through no fault of the product the charging port got damaged and I hate to part with this because of that. Any help whether authorized service recommendation or the replacement charging port info would be greatly appreciated

    • Mario – Thanks for your inquiry. Yes, a complete charging kit assembly can be purchased. It is Part No. 865-117-666. The best bet is to call our Tech Service line at 800.328.2921, option #2. They can help you get it ordered and shipped out. Thanks, Jim from Clore Automotive

  12. Greg Schulte says:


    I recently bought, and used the 660 jump starter. The first time that I attempted to use while attaching the black clamp to a non moving part of the frame a high pitched sound range out causing me to stop what I was doing. My neighbor came over ( he has had experience with jump starters) and told me that it was not necessary to attach the black clamp to the frame and proceeded to place it on the black battery terminal. The car was able to start the first time the key was turned. Do you have any idea what would have caused the high pitched sound, was this a hazard and would the car have started under those circumstances. I realize now that this way of jump starting the battery was risky and it will not be repeated.

  13. Is it safe to store a booster pac in a basement which has a gas furnace? It is possible for the pack to emit hydrogen or oxygen? If not, where do you recommend storing it? The temperature here can range between 0F and 100F

    • killian – yes. When the unit is in storage mode, it is inert. When charging, it should be done in a well ventilated area and only with an extension cord and the built-in charger. Using another charger (through the clamps, for instance) could result in excessive voltage or amperage, which would expel flammable hydrogen gasses. Thanks, Jim from Clore Automotive

  14. I have the 660 battery pack and the charging light blinks back and forth alternating the red and green light. What does mean?

    • Guy – Please call our Tech Line at 800.328.2921, option #2, and speak to our Tech Service team. They will be able to help determine the cause and offer a remedy. Thanks, Jim from Clore Automotive

  15. The battery in my JNCAIR no longer takes a charge. Do you sell replacement batteries and is it something I can do myself?

    • Mike – Thanks for your inquiry. You can order a new battery on this web site or call our Tech Service line at 800.328.2921, option #2. They will be able to assist you in getting a new battery. Thanks, Jim from Clore Automotive

  16. It just hit -32F here, bought 660 jump starter since my friends were all bragging it up…Can I leave it in my vehicle at that temperature for the day without problems? I would bring it inside each night so it wouldn’t be in those conditions for more than 10-12 hrs each day.

    • Nathan – It should be OK. There is a point at which the JNC660 battery will simply get too cold, but over the course of a day, it should perform, especially if you have it in the passenger area of your vehicle while it is in use. As you note, the key is to bring the unit indoors overnight when there are periods of extreme cold, as you are doing. Thanks, Jim from Clore Automotive

  17. We received 2 660s about 10 years ago,and they still work great. These units have jumped more vehicles of all types over these years and we always carry them in our vehicles. With a small 100 watt inverter they will power an led 100 watt flood at a rescue scene quietly. You folks make a very good and reliable product.

    • Frank – Thanks for your comment and kind words. We are glad your JNC660s have performed well for you. Thanks again, Jim from Clore Automotive

  18. DUANNE P. ANDERSON says:

    I’ve had my Jump n’ Carry for quite some time now. Several years. I recently tried to jump a vehicle and it would not work. I was just curious as to how long does the internal rechargeable battery of the unit last? The indicator gauge says that it is fully charged. However, it does not jump the the battery to start the engine of the vehicle. Is there a way to get a new battery for the unit installed? Thank you in advance for your help.

    • Duanne – Thanks for your question. Unit longevity depends on many factors, usually ranges from 2-5 years. I think the best course of action is to call our Tech Line at 800.328.2921, option #2. They will be able to help you confirm if the battery has reach its end of life and suggest next steps. Thanks, Jim from Clore Automotive

  19. Terry Layton says:

    I use a CPAP machine when I sleep and would like to use it while camping. Do you any units that I could use? Also need it in case I ever need to jump start my truck.

    • Terry – We speak to customers regularly who use our products to run their CPAP machines when they do not have access to AC power. Most often, they are using a JNC660 or JNC770R, and have had good success. I would just make sure your unit has a DC adapter with a 12V power plug (could connect to your vehicle’s 12V power port). If so, you should be good to go. Thanks, Jim from Clore Automotive

  20. David Pascuzzi says:

    Hello I have a jnc660 it will no longer hold a charge can the batteries be replay or do I got to buy a new unit

    • David – Your best best is to call our Tech Line. They will help diagnose your issue and offer options to resolve it. Thank you, Jim from Clore Automotive

  21. Good idea on focusing on power delivery instead of all the other ancillary stuff. At the end of the day, it’s the amount of power that’s going to jumpstart your car, not the ‘extra’ features.

    • Michael – Thanks for your input. We feel the same. While we have a few multi-functional units, our main focus is on extremely powerful, dedicated jump starting units. This is what our customers want. Thank, Jim from Clore Automotive

  22. For a layman, is there a practical difference between the Booster Pac products and the JNC products?

    Can they both be left in the trunk of a car year round? One of my concerns is over leaving the starter in a hot car. I’m in Atlanta and my car is parked outside at all times, so the temperature in the car is probably over 150 during the summer.

    • Mitch – Thanks for your question. In regards to the issue of heat, for the lead acid models, they are the same. Both brands utilize lead acid AGM batteries and are OK year round in your vehicle, similar to your vehicle’s starting battery. For our lithium models, both brands are again the same as it relates to heat. Lithium batteries are more sensitive to heat than AGM batteries and, although 150˚F temps shouldn’t cause an issue, if this is area of concern for you, it is probably makes sense to stick with traditional AGM models. Thanks, Jim from Clore Automotive

  23. Is there any type of short circuit protection built into the jnc660? Let’s say it tips over or something falls on it in the bed of my truck and the clamps short on a piece of angle iron or some random junk, is the pack going to explode or burst into flames?

    • The JNC660 has always live clamps. They are made from a non-conductive material, but if the jaws came into contact with a common conductor, that would be a problem, as outlined in the operator’s manual. We suggest either a.) securing the unit while it is transported (in a trunk or otherwise), or b.) purchasing a cover (JNCCVR) to avoid such an occurrence. Our premium mode, JNC770R, has a master on/off switch and would be a good alternative if trunk storage is a likely mode of use. They have the same power, but the JNC770R, in addition to the master ON/OFF switch, features longer cable reach (68″ vs 46″), adds USB outlets (2), adds a work light and utilizes a higher output built-in charger for faster recharging of the unit. Thanks, Jim from Clore Automotive

  24. JOHN O'KEEFE says:


    • John – Thanks for your inquiry. We suggest calling our Tech Service line at 800.328.2921, option #2. They should be able to help you resolve your issue. Thanks, Jim from Clore Automotive

  25. Hi Folks,
    I have a Jump-N-Carry Model 400 ( Yeah its old) 12 Volt, 1100 peak amps. Battery Died. Love this Model400 and would like to replace the battery but don’t know what size.
    Can you help me out with a source, Model, AMP rating?

    • Louis – Thanks for your question. The replacement battery kit is Model No. JNC105. It can be ordered through our website or by call our Customer Service department at 800.328.2921, option #1. Thanks, Jim from Clore Automotive

  26. Vince H Polidoro says:

    I have an ES5000 BoosterPac and its about 3 or 4 years old. Hardly ever used. I didn’t keep it charged and now I have been trying to charge it and it still shows all red lights. Is there something I can do to recharge it or is it trash now? I now realize I should have kept it charged.


    • Vince – Thanks for your question. I suggest that you call of Tech line at 800.328.2921, option #2. They will be able to offer suggestions. Thanks again, Jim from Clore Automotive

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