Picture this: you are running late for an appointment, you turn the key, and your car’s engine just clicks. A dead battery is a common frustration, but with a reliable jump starter, you can be back on the road in minutes. In this guide, we review the NOCO Boost Plus GB40 and compare it with four other popular NOCO models to help you choose the right portable power source for your vehicle. Whether you drive a compact car, a large SUV, or a diesel truck, understanding the differences between these jump starters is key. For a broader overview of NOCO’s lineup, check out The Ultimate NOCO Jump Starter Guide for 2026.
Buying Guide
Peak Amps and Engine Size Compatibility
The most critical specification for any jump starter is its peak amp rating, which determines the size of engine it can reliably start. The NOCO Boost GB40 delivers 1000 amps, making it suitable for engines up to 6.0L gas and 3.0L diesel. For larger vehicles like trucks and SUVs, you may need a more powerful model such as the GB70 with 2000 amps or the GB150 with 3000 amps. If you own a heavy-duty diesel truck, the GBX155 with 4250 amps is built for extreme performance. Always match the jump starter’s capability to your vehicle’s engine size for safe and effective operation. For more on truck-specific options, see best jump starter for trucks.
Safety Features and Build Quality
Safety is paramount when dealing with battery connections. NOCO’s UltraSafe technology includes spark-proof circuitry and reverse polarity protection, preventing dangerous sparks and ensuring correct connections every time. The GB40 and GB70 feature IP65-rated rugged housings that resist water, dust, and impact, making them durable companions for roadside emergencies. The newer GBX models incorporate UltraSafe 2.0 with enhanced thermal management. A well-built unit gives you confidence even in adverse weather conditions.
Portability and Additional Features
If you prioritize compactness, the GB40 weighs only 2.5 pounds and fits easily in a glove box. It also functions as a power bank for charging smartphones and tablets, and includes a 100-lumen LED flashlight with SOS and strobe modes. Larger models like the GB70 offer more power but are heavier at 5.0 pounds. The GBX155 features a 500-lumen flashlight and 60-watt USB-C Power Delivery for charging laptops. Consider how often you will carry the unit and what extra functions you value. For a comprehensive list of top-rated models, visit Best Jump Starter for 2026: Top 10 Portable Boosters Compared.
Recharge Time and Battery Capacity
How quickly a jump starter recharges can affect your readiness. The GB40 recharges in about 3 hours via USB-C, while the GB70 takes around 6 hours. The GBX155 supports USB-C Power Delivery and can recharge in just 2.7 hours, or provide a jump start after only 5 minutes of charging from a depleted state. Models with larger battery capacities can deliver more jump starts per charge, such as the GB70’s up to 40 starts versus the GB40’s 20 starts. Assess your typical usage frequency to choose a unit that stays ready when you need it.
Final Thoughts
After evaluating five NOCO jump starters, the NOCO Boost GB40 12V 1000A UltraSafe stands out as an excellent choice for everyday drivers of cars and small to midsize SUVs, offering a winning balance of compact size, safety, and reliable starting power. For those with larger vehicles or who need extra versatility, the NOCO Boost GB70 2000A UltraSafe Jump Starter provides higher peak amps and more jump starts per charge, making it a robust companion for trucks and diesel engines. Whichever model you choose, you are investing in a trusted brand known for quality and innovation in portable power.
Frequently Asked Questions
Can the NOCO Boost GB40 start a diesel engine?
Yes, the GB40 is rated for engines up to 3.0L diesel. For larger diesel engines, consider the GB70 or GBX155 for adequate power.
How long does the NOCO GB40 hold a charge?
When fully charged, the GB40 can hold its charge for up to 12 months under normal storage conditions. It is recommended to recharge it every 6 months to maintain optimal performance.
Is the NOCO Boost GB40 safe to use on modern cars?
Absolutely. The GB40 features spark-proof and reverse polarity protection, making it safe for use on all 12V vehicles, including modern cars with sensitive electronics. For more on battery maintenance, see best car battery charger and maintainer.
Can I use the NOCO GB40 as a power bank?
Yes, the GB40 includes a USB port for charging smartphones, tablets, and other small devices. It is a convenient backup power source during emergencies or outdoor activities.
