GOOLOO GT4000S
#3 in Heavy dutyFull review
A compact pack that covers big V8s and most diesel pickups and recharges in about an hour over USB-C. A strong pick for truck owners who also want a laptop power bank.
Amazon $99.96$99.96
The GOOLOO GT4000S is the better jump starter overall, rated 4.3 to 4.1. The GOOLOO GT4000S leads on features and value. The WOLFBOX MegaVolt 24Air wins on capacity and warranty. The GOOLOO GT4000S costs $40.03 less ($99.96 vs $139.99).
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
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 GOOLOO GT4000S for features (manual override, rated to -4 °F, USB-C charging, IP65 vs rated to -4 °F, USB-C charging, IP64) and value ($99.96 for its size vs $139.99 for its size).
- 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).
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 | GOOLOO GT4000S | WOLFBOX MegaVolt 24Air |
|---|---|---|
| Overall rating | 4.3/5 | 4.1/5 |
| Value 40% | 100 $99.96 for its size | 89 $139.99 for its size |
| Features 35% | 90 manual override, rated to -4 °F, USB-C charging, IP65 | 70 rated to -4 °F, USB-C charging, IP64 |
| Capacity 15% | 42 74 Wh battery | 61 88.8 Wh battery |
| Warranty 10% | 25 1.5-year warranty | 50 2-year warranty |
Specifications
| GOOLOO GT4000S | WOLFBOX MegaVolt 24Air | |
|---|---|---|
| Starting | ||
| Rated engines | 12 L gas, 10 L diesel | 10 L gas, 6 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 | 74 Wh | 88.8 Wh |
| Capacity (mAh) | 20,000 mAh | 24,000 mAh |
| USB-C input | 100 W | 65 W |
| Recharge time | 1.2 hours | 2 hours |
| USB outputs | USB-C 100 W, USB-A 18 W, 15 V DC 10 A | USB-C 65 W, USB-A 18 W, USB-A 12 W |
| Build | ||
| Flashlight | Yes | Yes |
| Air compressor | No | Yes |
| Water resistance | IP65 | IP64 |
| Dimensions | 9.05 x 3.93 x 2.12 in | 9.39 x 5.28 x 2.16 in |
| Weight | - | 3.4 lb |
| Warranty | 1.5 years | 2 years |
| Released | 2022-07 | 2025-06 |