NOCO GB40 vs WOLFBOX MegaVolt24 (MV24)
The short answer
WOLFBOX MegaVolt24 (MV24) comes out ahead overall with 8.1/10 against 5.9/10 for the NOCO GB40. WOLFBOX MegaVolt24 (MV24) is stronger on starting power, battery capacity & standby, ease of use & safety features, versatility and value. At current verified prices, the NOCO GB40 costs about $20.04 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 WOLFBOX MegaVolt24 (MV24) if: Most drivers, from compact cars to V8 pickups, who want one pack with plenty of power, a big usable battery and fast USB-C at a mid-range price.
Scores by criterion
| Criterion | NOCO GB40 | WOLFBOX MegaVolt24 (MV24) |
|---|---|---|
| Starting Power | 6.5Fine for typical cars; needed the override on a dead battery; 6L gas/3L diesel limit. | 8.3Three back-to-back starts on a drained Explorer; TechGearLab power sub-score 9.0. Capped for single-lab evidence and no cold test. |
| Battery Capacity & Standby | 4.015.57 Wh measured of 24 Wh claimed; one jump took it to 25%. | 8.882.3 Wh measured of 88.8 Wh claimed (93%); 3% used per start; 65W recharge. |
| Ease of Use & Safety Features | 6.06-inch leads and stiff clamps; simple controls; spark-proof. | 7.3Large LCD and a clear START indicator; stubby clamps struggle on cramped terminals; On button can be pressed accidentally in the case. |
| Build Quality & Durability | 7.8IP65 with a long track record; soft bag only. | 8.0IP64, storage case included, lifetime warranty listed by WOLFBOX. |
| Versatility | 4.510W USB and a light only. | 7.565W USB-C PD and a light with strobe; no compressor. |
| Battery Safety & Sustainability | 6.0No sparks seen in testing; Prop 65 notice; no UL 2743 confirmed. | 6.0Lithium-ion with reverse-polarity protection; no UL 2743 or other certification listed; no recalls found. |
| Value | 6.0$99.95 is high for its capacity. | 8.7$119.99 for near-flagship lab results; third-party seller and price swings noted. |
Specifications
| Spec | NOCO GB40 | WOLFBOX MegaVolt24 (MV24) |
|---|---|---|
| Peak Current | 1,000 A | 4,000 A |
| Max Gas Engine (rated) | 6 L | 10 L |
| Max Diesel Engine (rated) | 3 L | 10 L |
| Battery Chemistry | Lithium-ion | Lithium-ion |
| Rated Capacity | 24 Wh | 88.8 Wh |
| Measured Usable Capacity (TechGearLab) | 15.57 Wh | 82.3 Wh |
| Weight | 2.4 lb | 3.2 lb |
| Built-in Air Compressor | No | No |
| Max USB Output | 10 W | 65 W |
| Water/Dust Rating | IP65 | IP64 |
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 →WOLFBOX MegaVolt24 (MV24)
Pros
- Started a fully drained SUV three times in a row
- 82.3 Wh usable battery, close to the 88.8 Wh claim
- 65W USB-C can charge a laptop
- IP64 rating and a storage case included
- Light at 3.2 lb
Cons
- Stubby clamps can be hard to fit on cramped terminals
- The easy-press On button can be pressed in the case and drain the battery
- Amazon sells several variants with different diesel ratings, so check you get the 10L/10L, 88.8 Wh listing
- No built-in air compressor
The best balance of power, capacity and price for most drivers, from compact cars to V8 pickups. Confirm the exact 88.8 Wh variant when you order.
Full WOLFBOX MegaVolt24 (MV24) 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.