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Getting the Most from Your Jump Starter


Editor’s Note: We are revisiting the most popular article among all the articles we have published on this blog. It is also one of the most useful article we have ever published. This time of year, we have many, many new newsletter recipients who have entered our world through the purchase of a new jump starter. These tips are great for the owner of a new jump starter, so we hope you find them helpful.

There are several best practices that, if adhered to, will keep your jump starter in good operating condition and support a long service life. Keeping these steps in mind could extend the life of your jump starter as much as 2-3 times longer than if they are not followed.

1. Keep your jump starter charged and avoid letting the unit sit in a highly discharged state for any length of time. Remember, jump starter batteries have no memory issues and cannot be harmed by frequent charges, even when only slightly discharged. The best practice is to charge a jump starter after each use. Even in those cases where this type of charge frequency is unrealistic, nightly charging should be done if the unit is used frequently. In those cases where the jump starter is not regularly used, charge it every 3 months to ensure that the battery is not sitting in a discharge state for extended periods. In periods of extreme cold, where the jump starter is left in a vehicle parked outdoors overnight, charging once per month is recommended.


2. Respect the duty cycle of your jump starter. Every jump starter is subject to a duty cycle in which the vehicle can be cranked only so long before a period of rest (for the jump starter) is needed – see your operator’s manual for the specific details of your jump starter. For almost all Clore Automotive jump starters, the recommended duty cycle is 6 seconds of cranking followed by 3 minutes of rest.  This will avoid excessive heat build-up within the jump starter battery, which can damage its internal construction and reduce its useful life.


3. Whenever possible, store your jump starter in a moderate temperature environment, between 50˚F and 70˚F (10˚-20˚C). Like vehicle batteries, exposure to extreme temperatures is detrimental to jump starter batteries, both in the short term and long term. For instance, a jump starter stored at 20˚F will have less jump starting power for a needed jump start than one stored at 60˚F. We realize that, in many parts of North America and the world, storing your jump starter in a vehicle means storing it in temperatures well below 50˚F. We get calls on this all the time. In these cases, your jump starter should serve you just fine. Please see our note in number 1 above regarding charging frequency in extreme cold spells. Also, if your low is going to be -30˚F overnight and you have a critical event the next morning, it is probably a good idea to bring your jump starter in for the night (better safe than sorry).


4. When you have completed a successful jump start, it is important to disconnect the jump starter from the now running vehicle as quickly as possible, always remembering to follow all safety procedures and the proper disconnection sequence. Typical vehicle alternator output is much higher than the recommended recharge rate for a jump starter battery. Charging a battery (any battery) at a rate greater than the recommended charge rate is detrimental to its long term health. Many technicians leave the jump starter connected after a successful start, thinking that it is a fast and easy way to get the unit recharged, but this practice should be avoided.


5. Following all recommended safety procedures is not only best for your personal safety and the well being of your vehicle, it is also best for long jump starter life. We know it’s a hassle to find a proper engine or chassis ground to which to connect the negative jump starter lead. But, it is way safer to make the effort and reduces potential damage to your jump starter. Other safety steps also reduce the likelihood of putting the jump starter in a compromising situation. Even if your jump starter (and vehicle) survive that reverse polarity near miss, it can take a tool on the battery’s state of health. Take your time, do it right – your jump starter will be glad you did.


6. Until now, our focus has been on the battery, which is the heart of a jump starter and the most critical component impacting its durability and service life. That said, other factors should be kept in mind. Remember that many batteries the jump starter comes into contact with are in poor condition, which can result in battery acid on or around the posts. After jumping a vehicle with a battery in such a condition, wipe down your clamps (particularly the positive, which is the only clamp that should contact the battery) with a clean cloth to remove any residual battery acid. For clamps that have a high level of acid contact, a mixture of baking soda and water can be used with a wire brush.


Following these simple steps can greatly extend the life of your jump starter and also help to ensure that your jump starter is ready for service each time you need it.


2 Responses

    1. Frank – Sorry about that. You JNC345 should have included a wall charger with cable. If your model is a GEN1 version, the charger would have a fixed cord with pin jack termination that plugs into the pin jack input port on the unit. If your model is a recently introduced GEN2 version, the charger has a separate USB-A too USB-C cord. The USB-A end of the cord plugs into the wall charger and the USB-C end of the cord plugs into the USB-C input port on the unit. Thanks, Jim from Clore Automotive

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