The CarRundown verdict.
Our pick for drivers looking for a compact 12V jump starter within NOCO’s stated engine limits, with straightforward portability and useful built-in lighting.
The GB40 is the kind of equipment you buy for the day you hope never comes. Its appeal is simple: a portable jump starter that can live with your other road essentials. We recommend it as part of a prepared-car kit when your vehicle falls within NOCO’s specified application range.
The details that matter.
- Model
- GB40 Boost Plus
- Electrical system
- 12V
- Manufacturer peak rating
- 1,000 amps
- Gas engines
- Up to 6.0L, manufacturer rating
- Diesel engines
- Up to 3.0L, manufacturer rating
- Weight
- 2.4 lb, manufacturer specification
What stands out
- Compact equipment for a useful roadside task
- Spark-proof technology and reverse-polarity protection
- Integrated flashlight and USB device charging
- Clear gas and diesel engine application limits
Before you buy
- A 12V product, not a universal fit for every vehicle
- Needs charging and periodic checks before an emergency
- Does not diagnose or repair a failing battery or charging system
The right size for the right job
The GB40 is rated by NOCO for gasoline engines up to 6.0 litres and diesel engines up to 3.0 litres. Those are manufacturer application limits, not a promise that every flat battery will respond identically. Vehicle condition, battery condition and operating circumstances still matter. Start by checking the electrical system and engine application rather than comparing peak-amp labels alone. A larger truck or a different battery system calls for a different product.
What we like about the format
At a manufacturer-listed 2.4 pounds, the GB40 is easy to treat as dedicated vehicle equipment rather than something that only leaves a garage shelf when trouble starts. The integrated light is useful when locating connections, and USB charging gives the pack a secondary role. Our reason for recommending it is its focused design: it brings a clearly defined roadside function into a manageable package. It is not a substitute for a broader emergency kit.
Prepared means charged
A jump starter only helps if you can find it and it has been maintained. Keep the pack accessible, follow NOCO’s storage-temperature and charging instructions, and make its charge status part of your periodic vehicle checks. Read the manual before an emergency, including the meaning of indicator lights. For jump-starting, use the connection points and sequence specified by both the vehicle manufacturer and NOCO.
When to choose something else
A car that repeatedly needs a jump needs diagnosis. A portable pack can help with the immediate situation; it does not establish why the battery went flat. Owners of vehicles beyond the stated engine limits should compare a correctly sized unit. If your main goal is maintaining a stored vehicle over weeks or months, look at a compatible battery maintainer rather than treating a jump starter as a permanent charging solution.
A good fit for
Drivers of compatible 12V vehicles who want a compact jump starter as part of their road kit.
Consider another option if
Owners of 24V systems or vehicles beyond the stated engine range, and anyone shopping primarily for long-term battery maintenance.
Keep reading: Build a useful car emergency kit.
Your questions, answered.
What engines is the GB40 rated for?
NOCO lists gasoline engines up to 6.0L and diesel engines up to 3.0L on compatible 12V systems. Follow the current manual for your vehicle and the jump starter.
Is it a battery charger?
Its primary role is jump-starting a compatible 12V vehicle. Choose a suitable maintainer or charger for ongoing battery charging.
Is there a CarRundown discount code for NOCO?
We do not currently list a confirmed CarRundown code for NOCO. The official store shows current pricing and promotions.
Product specifications checked against NOCO’s official product information on October 19, 2026. Recommendations are our editorial assessment. Our editorial standards.
