NOCO Boost X Jump Starters: GBX45, GBX55, GBX75 & GBX155

NOCO Boost X portable lithium jump starters are intended for emergency starting of compatible 12-volt vehicle batteries. The GBX45, GBX55, GBX75 and GBX155 vary by peak starting current, manufacturer-listed gasoline and diesel engine size, and internal battery capacity. The most powerful model is not automatically the correct choice for every vehicle or battery system. This guide compares the four models and identifies two related accessories offered by UsedRVParts.

NOCO Boost X size and starting-power chart

Model Peak starting current Gasoline rating Diesel rating Internal battery
GBX45 1,250A Up to 6.5L Up to 4.0L 31Wh
GBX55 1,750A Up to 7.5L Up to 5.0L 46Wh
GBX75 2,500A Up to 8.5L Up to 6.5L 74Wh
GBX155 4,250A Up to 10.0L Up to 8.0L 99Wh

These are NOCO's published maximum engine displacement ratings for compatible 12V gasoline and diesel starting applications. They are not a promise of successful starting in every circumstance: cold weather, poor battery condition, engine condition and electrical faults can affect the required starting power. The internal Wh figures describe the jump starter's own lithium battery capacity, not the battery capacity of the vehicle.

For smaller enginesGBX45 supplies 1,250A of peak power, with a 31Wh internal battery and NOCO-listed engine applications up to 6.5L gasoline and 4.0L diesel. GBX55 increases the peak current to 1,750A and covers up to 7.5L gasoline and 5.0L diesel.
For larger starting loadsGBX75 provides 2,500A, with published engine ratings up to 8.5L gasoline and 6.5L diesel. GBX155 is the 4,250A option with a 99Wh internal battery and published ratings up to 10.0L gasoline and 8.0L diesel.

What to check before selecting a portable jump starter

  1. Confirm battery voltage. These four Boost X models are intended for 12V starting systems. Do not connect one directly to a 24V starting system, a high-voltage hybrid/EV traction system or an application outside NOCO's instructions.
  2. Check engine displacement and fuel type. Compare the actual gasoline or diesel engine size with the model-specific published limit. The vehicle badge or body size does not establish engine compatibility.
  3. Consider the starting conditions. Cold temperatures, battery damage and engine mechanical problems can increase starting demand. A portable booster does not diagnose or repair the underlying fault.
  4. Follow the clamp connection procedure. NOCO's UltraSafe protection includes safeguards against common connection errors, but the battery terminals and vehicle manufacturer's procedures must still be followed.
  5. Keep the booster charged. NOCO specifies USB-C Power Delivery recharging on these models. Recharging time depends on the charger and cable used; a lower-output USB supply can take longer.
  6. Inspect accessories separately. A protective case is a storage accessory and a USB-C charger restores the Boost X's charge. Neither increases the starter's peak output or turns it into a 12V battery charger for maintaining the vehicle's battery.
Using Manual Override: Certain NOCO jump-starting procedures allow a manual override for severely discharged batteries. The manufacturer's warnings state that override mode disables important safety protections. Follow the exact manual and never use it to bypass uncertain polarity, a damaged battery or a non-12V system.

Which NOCO accessories go with these models?

U65 is a separate 65-watt USB-C AC power supply listed for GBX45, GBX55, GBX75 and GBX155. It accepts 100–240V AC and includes interchangeable mains plug adapters. It charges the jump starter's internal battery; it is not a vehicle charging or maintenance unit.

GBC101 is a semi-rigid EVA storage case designed specifically for GBX45. Its model-specific fit should not be assumed to accommodate the larger GBX55, GBX75 or GBX155 jump starters.

Shop exact NOCO Boost X models

These product cards link to the corresponding UsedRVParts.ca listings. Check current condition and availability before ordering. The store sells brand-new as well as used RV, towing and marine parts; eligible used items may be viewed or picked up in Kelowna by appointment.

Compatible charger and storage case listings

Related battery charging equipment

If you need continuous charging and maintenance rather than emergency starting, see our NOCO GEN5X and GENPRO10X marine battery-charger comparison. Those are dedicated onboard chargers with independently controlled charging banks, not portable jump starters.

Récemment consulté

Inventaire de pièces détachées pour VR, nouveau et mis à jour – Consultez-le régulièrement

Nous ajoutons constamment des pièces neuves et d'occasion pour véhicules récréatifs à notre inventaire, alors assurez-vous de consulter régulièrement notre site.

Si vous ne trouvez pas la pièce dont vous avez besoin aujourd'hui, nous l'avons peut-être encore en stock : notre base de données interne comprend des milliers de pièces neuves pour véhicules de loisirs qui ne sont pas encore répertoriées en ligne.

Envoyez-nous un SMS ou un e-mail avec le numéro de produit ou le modèle , et nous vérifierons immédiatement sa disponibilité pour vous.

Nos produits

Liens rapides populaires

Réfrigérateurs d'occasionNouvelles pièces de réfrigérateurFournaises d'occasionNouveaux chauffe-eauNouveaux fours et plaques de cuissonClimatiseursNouveaux auvents et pièces détachéesPortes et fenêtres neuvesAttelages et Boîtiers d'AttelageCellule de campingAccessoires pour camionsMarine

Bulletin d'information sur les pièces de camping-car

Inscrivez-vous pour les promotions à venir !