NOCO Boost GBX55 vs Clore JNC660: Best Portable Jump Starter in 2026

That does buyers a disservice, because these two units represent genuinely different philosophies — and the right choice depends entirely on what you drive and how you store your gear. The NOCO Boost GBX55 is a lithium-ion unit rated at 1750 peak amps, weighing around 2.4 pounds. It is compact enough to drop in a jacket pocket and ships with a built-in LED flashlight, USB-A charging port, and NOCO's proprietary spark-proof clamp technology. It handles gas engines up to 8.5 liters and diesel up to 6 liters, making it genuinely capable for full-size trucks and SUVs. The Clore Automotive JNC660 is a lead-acid booster pack rated at 1700 peak amps and 425 cranking amps. It weighs approximately 18 pounds and is built around an internal sealed lead-acid battery. It includes a built-in 12V DC outlet, a digital voltmeter, and heavy-gauge clamp cables. Street price on Amazon sits noticeably higher than the GBX55 on a per-pound basis, though both land in a competitive mid-range bracket. On paper the peak amp numbers look similar. In practice, as you will see below, the technology gap between lithium and lead-acid creates real-world differences that specs alone do not capture. Also worth noting for automotive shoppers: the NOCO Boost Plus GB40 is a smaller sibling in the NOCO lineup suited to everyday passenger cars, while the GBX55 steps up for larger engines.

Lithium cells hold their charge for months without being plugged in — NOCO claims the GBX55 retains a usable charge for up to one year in storage. That is a meaningful real-world advantage: you toss it in your trunk in January, forget about it, and it is still ready in November when your battery dies in a parking lot. Lead-acid, which powers the Clore JNC660, self-discharges significantly faster. Clore recommends recharging the unit every 30 days during storage. If you are the type of driver who keeps a jump starter in the car and never thinks about it, a lead-acid pack is a gamble. On the other hand, lead-acid chemistry is extremely well understood, tolerates a wider range of ambient temperatures, and does not carry the same sensitivity to deep discharge that lithium cells do. In very cold climates — think sub-zero mornings — lead-acid can sometimes outperform lithium because lithium cells lose capacity rapidly below freezing, while lead-acid degrades more gradually. For most buyers in moderate climates who want a set-and-forget solution, lithium wins on convenience. For buyers in extreme cold or those who want a unit that is harder to damage through neglect, lead-acid has a legitimate argument. Neither technology is universally superior — the right answer depends on your environment and your habits.

The Clore JNC660 is rated at 425 cranking amps, a spec Clore publishes openly and that independent reviewers consistently validate. The NOCO GBX55 does not publish a traditional cranking amp figure; NOCO instead rates its units by peak amps and engine displacement compatibility. In practice, published Amazon reviews and third-party automotive press tests show the GBX55 starting large V8 gas engines and mid-size diesel trucks reliably. The Clore JNC660 has a long track record — it has been a professional shop staple for years — and its lead-acid design means it can deliver sustained current repeatedly without the voltage sag that cheaper lithium units sometimes exhibit. For a gas-powered passenger car or light truck, both units are more than sufficient. Where the distinction matters is at the extremes: very large diesel engines in genuinely cold weather. In that specific scenario, the Clore's published cranking amp rating and its lead-acid tolerance for cold give it a slight edge in confidence, even if the NOCO handles the same job under normal conditions. For the vast majority of drivers with gas-powered vehicles, the GBX55's real-world starting power is not a limiting factor.

It fits in a glove box, a laptop bag, or a coat pocket. For commuters, rideshare drivers, or anyone who keeps a jump starter in a compact car or crossover, this portability is a genuine quality-of-life advantage. You are far more likely to actually have it with you when you need it. The Clore JNC660 weighs approximately 18 pounds. It is a substantial piece of equipment — closer in feel to a car battery than to a gadget. It takes up meaningful trunk space and is not something you will carry into a hotel or toss in a backpack. That said, its size is not purely a liability. The larger housing accommodates longer, heavier-gauge clamp cables that reach awkward engine bays more easily. For fleet operators, contractors, or anyone running a work truck who parks in the same lot every day, the weight is a non-issue and the robust build is a positive. For everyday consumer use, the portability gap strongly favors the NOCO. For professional or semi-professional use where the unit lives in a truck bed or service vehicle, the Clore's bulk is acceptable and its durability track record is a genuine asset. A portable air compressor like the AstroAI AIRUN-H is another trunk-worthy tool that pairs well with either jump starter for full roadside readiness.

This is a meaningful safety feature for inexperienced users who may not be confident about positive and negative terminal identification. The unit also includes over-voltage protection, short-circuit protection, and over-current protection. NOCO backs the GBX55 with a one-year warranty, extendable to three years upon registration. The Clore JNC660 includes reverse polarity protection via an audible alarm and indicator light, but it does not use spark-proof clamp technology in the same way. That means a user who connects clamps incorrectly will get an alarm rather than automatic current cutoff — a distinction worth noting for less experienced users. Clore backs the JNC660 with a one-year warranty on the unit and a separate warranty on the internal battery. Clore has a strong reputation in the professional automotive market for building equipment that lasts; the JNC660 has been in production for many years with consistent reviews praising longevity. For long-term reliability, the lead-acid battery in the Clore is a known quantity — it will eventually need replacement after several years of use, but replacement batteries are widely available. Lithium cells in the GBX55 degrade over charge cycles and are not user-replaceable, though NOCO's warranty and customer service reputation on Amazon is generally strong. Pairing either unit with a quality OBD2 scanner like the OBDLink MX lets you monitor your vehicle's charging system health and catch a failing alternator before it leaves you stranded again.

If you drive a gas-powered passenger car, SUV, or light truck and you want something you can forget about until you need it, the GBX55 is the clear winner. Its spark-proof clamps also make it more forgiving for drivers who do not jump-start vehicles regularly. The Clore JNC660 is the right buy for a specific type of user: the professional or semi-professional who works on multiple vehicles, operates in consistently cold climates, or wants a unit with a published cranking amp spec and a track record in commercial settings. Its weight and bulk are not dealbreakers in a work truck. Its lead-acid design is more tolerant of certain abuse patterns, and its heavy-gauge cables are genuinely useful in professional scenarios. If you are a fleet manager, a mechanic who needs a shop-grade booster pack, or someone in a region where temperatures regularly drop well below freezing, the JNC660 earns its place. For the average Amazon buyer reading this guide, the NOCO GBX55 wins on almost every consumer-relevant dimension. The Clore JNC660 is not a bad product — it is a very good one — but it is optimized for a use case that most personal vehicle owners do not have. Buy the NOCO if you want the best portable jump starter for everyday use. Buy the Clore if you need a workhorse booster for professional or extreme-cold applications. While you are outfitting your vehicle for emergencies, a set of reliable floor protection like the WeatherTech All-Weather Floor Mats and a quality car wash kit such as the Chemical Guys HOL169 14-Piece Kit round out a well-prepared vehicle setup.