WOLFBOX MegaVolt 24Air
#5 in Heavy dutyFull review
For truck and SUV owners who want a jump starter and a fast tire inflator in one box. It covers gas engines up to 10 liters for little more than the 16Air.
Amazon $139.99$139.99
The WOLFBOX MegaVolt 24Air and the GOOLOO GP4000 are evenly matched, rated 4.1 and 4.1. The WOLFBOX MegaVolt 24Air leads on capacity and warranty. The GOOLOO GP4000 wins on value. The GOOLOO GP4000 costs $60.03 less ($79.96 vs $139.99).
GOOLOO GP4000
#8 in Heavy dutyFull review
A slim, low-priced pack rated for any gas engine and big diesels. A strong value for truck owners who can live with an overnight recharge.
Amazon $79.96$79.96
Prices were last checked October 30, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the WOLFBOX MegaVolt 24Air for capacity (88.8 Wh battery vs 74 Wh battery) and warranty (2-year warranty vs 1.5-year warranty).
- Choose the GOOLOO GP4000 for value ($79.96 for its size vs $139.99 for its size).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every heavy duty jump starter; a clear win is highlighted. How we rank explains each one.
| Factor weight | WOLFBOX MegaVolt 24Air | GOOLOO GP4000 |
|---|---|---|
| Overall rating | 4.1/5 | 4.1/5 |
| Value 40% | 89 $139.99 for its size | 100 $79.96 for its size |
| Features 35% | 70 rated to -4 °F, USB-C charging, IP64 | 70 manual override, rated to -4 °F, USB-C charging |
| Capacity 15% | 61 88.8 Wh battery | 42 74 Wh battery |
| Warranty 10% | 50 2-year warranty | 25 1.5-year warranty |
Specifications
| WOLFBOX MegaVolt 24Air | GOOLOO GP4000 | |
|---|---|---|
| Starting | ||
| Rated engines | 10 L gas, 6 L diesel | all gas, 10 L diesel |
| Peak amps (maker) | 4,000 A | 4,000 A |
| Cranking amps | - | 800 A |
| Voltage | 12 V | 12 V |
| Manual override | - | Yes |
| Lowest operating temperature | -4 °F | -4 °F |
| Battery and charging | ||
| Chemistry | Lithium-ion | Lithium-ion |
| Capacity | 88.8 Wh | 74 Wh |
| Capacity (mAh) | 24,000 mAh | - |
| USB-C input | 65 W | 15 W |
| Recharge time | 2 hours | 8 hours |
| USB outputs | USB-C 65 W, USB-A 18 W, USB-A 12 W | USB-C 15 W, USB-A QC 3.0 18 W, USB-A 5 V/2.1 A, 15 V DC 10 A |
| Build | ||
| Flashlight | Yes | Yes |
| Air compressor | Yes | No |
| Water resistance | IP64 | - |
| Dimensions | 9.39 x 5.28 x 2.16 in | 8.98 x 3.92 x 1.50 in |
| Weight | 3.4 lb | 1.8 lb |
| Warranty | 2 years | 1.5 years |
| Released | 2025-06 | 2021-07 |