GOOLOO GT4000S
#1 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 $99.99$99.99
The GOOLOO GT4000S is the better jump starter overall, rated 4.4 to 3.9. The GOOLOO GT4000S leads on value and features. The GOOLOO GT4000S costs $100 less ($99.99 vs $199.99).
KeenPower SC6000 Pro Supercapacitor
#3 in Heavy dutyFull review
For drivers in very cold places, or who leave a jump starter in the car for years and forget to charge it. Most people get more for their money from a lithium pack.
Amazon $199.99$199.99
Prices were last checked October 22, 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 value ($99.99 for its size vs $199.99 for its size) and features (manual override, rated to -4 °F, USB-C charging, IP65 vs manual override, rated to -45 °F).
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 | KeenPower SC6000 Pro Supercapacitor |
|---|---|---|
| Overall rating | 4.4/5 | 3.9/5 |
| Value 40% | 100 $99.99 for its size | 71 $199.99 for its size |
| Features 35% | 90 manual override, rated to -4 °F, USB-C charging, IP65 | 80 manual override, rated to -45 °F |
| Capacity 15% | 50 capacity not published in Wh (neutral score used) | 50 capacity not published in Wh (neutral score used) |
| Warranty 10% | 50 warranty not published (neutral score used) | 50 warranty not published (neutral score used) |
Specifications
| GOOLOO GT4000S | KeenPower SC6000 Pro Supercapacitor | |
|---|---|---|
| Starting | ||
| Rated engines | 12 L gas, 10 L diesel | all gas |
| Peak amps (maker) | 4,000 A | 6,000 A |
| Voltage | 12 V | 12 V |
| Manual override | Yes | Yes |
| Lowest operating temperature | -4 °F | -45 °F |
| Battery and charging | ||
| Chemistry | Lithium-ion | Supercapacitor |
| Capacity (mAh) | 20,000 mAh | - |
| USB-C input | 100 W | - |
| Recharge time | 1.2 hours | - |
| USB outputs | USB-C 100 W, USB-A 18 W, 15 V DC 10 A | - |
| Build | ||
| Flashlight | Yes | - |
| Air compressor | No | No |
| Water resistance | IP65 | - |
| Dimensions | 9.05 x 3.93 x 2.12 in | - |
| Weight | - | 11.5 lb |