NOCO GB40 vs GB50: engine limits and power compared
Compare NOCO Boost GB40 and GB50 by peak current, stated engine limits, starts per charge, recharge time, and flashlight output.
Information checked August 5, 2026
Quick verdicts
Larger stated engine limits
GB50 lists support for gas engines up to 7.0 liters and diesel engines up to 4.5 liters. Both limits are higher than the GB40 figures.
Shorter stated recharge time
The GB40 listing states a three-hour recharge, while the GB50 listing states five hours. GB40 is the quicker option by those source figures.
Side-by-side comparison
| Product | Good fit for | Peak current | Stated engine limit | Starts per charge | Stated recharge time | Flashlight |
|---|---|---|---|---|---|---|
| NOCO Boost GB40 Jump Starter | Smaller engines and shorter stated recharging | 1,000 amps | Up to 6.0-liter gas or 3.0-liter diesel | Up to 20 per charge | 3 hours | 100 lumens with 7 modes |
| NOCO Boost GB50 Jump Starter | Larger engines and more starts per charge | 1,500 amps | Up to 7.0-liter gas or 4.5-liter diesel | Up to 30 per charge | 5 hours | 200 lumens with 7 modes |
NOCO Boost GB40 Jump Starter
- Good fit for
- Smaller engines and shorter stated recharging
- Peak current
- 1,000 amps
- Stated engine limit
- Up to 6.0-liter gas or 3.0-liter diesel
- Starts per charge
- Up to 20 per charge
- Stated recharge time
- 3 hours
- Flashlight
- 100 lumens with 7 modes
NOCO Boost GB50 Jump Starter
- Good fit for
- Larger engines and more starts per charge
- Peak current
- 1,500 amps
- Stated engine limit
- Up to 7.0-liter gas or 4.5-liter diesel
- Starts per charge
- Up to 30 per charge
- Stated recharge time
- 5 hours
- Flashlight
- 200 lumens with 7 modes
Products in this comparison
NOCO Boost GB40 Jump Starter
Good fit for: Smaller engines and shorter stated recharging
NOCO GB40 lists 1,000 amps, up to 20 starts per charge, and support for gas engines up to 6.0 liters or diesel engines up to 3.0 liters.
Read product details
NOCO Boost GB50 Jump Starter
Good fit for: Larger engines and more starts per charge
NOCO GB50 raises the listing figures to 1,500 amps and up to 30 starts. Its stated engine limits are 7.0 liters for gas and 4.5 liters for diesel.
Read product detailsHow we compared them
We compared current NOCO Boost GB40 and GB50 listings using the same five fields: peak current, stated gas and diesel engine limits, starts per charge, recharge time, and flashlight output. GadgetWunder has not jump-started a vehicle with either unit. The conclusions below use the cited listing figures and do not treat marketplace ratings as performance evidence.
What we left out
- Other NOCO Boost and Boost X models GB20, GB70, and Boost X units target different engine limits and charging systems. This page stays focused on the adjacent GB40 and GB50 models.