NOCO GB40 vs NOCO GBX155
The short answer
NOCO GBX155 comes out ahead overall with 7.8/10 against 5.9/10 for the NOCO GB40. NOCO GB40 is stronger on value. NOCO GBX155 is stronger on starting power, battery capacity & standby, ease of use & safety features and versatility. At current verified prices, the NOCO GB40 costs about $270.00 less.
- Choose the NOCO GB40 if: Owners of typical cars and small SUVs (up to 6.0L gas) who want a small, IP65 weatherproof pack sold and shipped by Amazon.
- Choose the NOCO GBX155 if: Owners of large V8s, diesels or fleets who want the most proven power and capacity and will pay a premium.
Scores by criterion
| Criterion | NOCO GB40 | NOCO GBX155 |
|---|---|---|
| Starting Power | 6.5Fine for typical cars; needed the override on a dead battery; 6L gas/3L diesel limit. | 9.34250A; best results in TechGearLab's test. |
| Battery Capacity & Standby | 4.015.57 Wh measured of 24 Wh claimed; one jump took it to 25%. | 9.086.1 Wh measured, the most usable energy in the pool. |
| Ease of Use & Safety Features | 6.06-inch leads and stiff clamps; simple controls; spark-proof. | 7.0Buttons and indicators are less clear than rivals' (TechGearLab). |
| Build Quality & Durability | 7.8IP65 with a long track record; soft bag only. | 7.5Solid build but 5.8 lb, no case, no IP rating confirmed. |
| Versatility | 4.510W USB and a light only. | 7.560W USB-C PD; no compressor. |
| Battery Safety & Sustainability | 6.0No sparks seen in testing; Prop 65 notice; no UL 2743 confirmed. | 6.0Spark-proof and reverse-polarity protection; 99 Wh; no UL 2743 confirmed. |
| Value | 6.0$99.95 is high for its capacity. | 5.5About $370, roughly 3x the MV24's price. |
Specifications
| Spec | NOCO GB40 | NOCO GBX155 |
|---|---|---|
| Peak Current | 1,000 A | 4,250 A |
| Max Gas Engine (rated) | 6 L | 10 L |
| Max Diesel Engine (rated) | 3 L | 8 L |
| Battery Chemistry | Lithium-ion | Lithium-ion |
| Rated Capacity | 24 Wh | 99 Wh |
| Measured Usable Capacity (TechGearLab) | 15.57 Wh | 86.1 Wh |
| Weight | 2.4 lb | 5.8 lb |
| Built-in Air Compressor | No | No |
| Max USB Output | 10 W | 60 W |
| Water/Dust Rating | IP65 | IP65 (ports closed) |
| Min Operating Temperature (rated) | — | -4 °F |
| Automatic Cell Preheat for Extreme Cold | — | No |
NOCO GB40
Pros
- IP65 water and dust resistance
- Compact at 2.4 lb
- Spark-proof and reverse-polarity protection
- Recommended by four major test outlets
- Sold by Amazon
Cons
- Small usable battery: 15.57 Wh measured
- Very short leads (about 6 in.), so the pack must sit on the battery
- Slow 10W USB-C and about 3 hours to recharge
- Soft bag rather than a hard case
A dependable weatherproof pack for typical cars and small SUVs. It ranks last on our weighted score because of its small battery, but it suits owners who value size and weather resistance. If you order one, check that the port is USB-C.
Full NOCO GB40 review →NOCO GBX155
Pros
- Highest-scoring unit in TechGearLab's test
- Rated for 10L gas and 8L diesel
- 86.1 Wh measured usable battery
- Spark-proof and reverse-polarity protection
- Sold directly by Amazon
Cons
- Premium price
- Heavy at 5.8 lb, with no storage case
- Buttons and indicators are less clear than rivals'
- No air compressor
The pick for owners of large diesels and fleet vehicles who value proven power over price. Most drivers get more for their money elsewhere.
Full NOCO GBX155 review →Both products are part of our guide The Best Jump Starters of 2026, where you can see every pick, how we score and current prices from each retailer.