The GOOLOO A9 Ultra and the KeenPower SC6000 Pro Supercapacitor are evenly matched, rated 4.0 and 3.9.
GOOLOO’s top combined jump starter and inflator, rated for any gas engine and big diesels, with fast 100 W USB-C charging. Worth it if you want one heavy-duty tool for trucks, RVs and travel.
Amazon $199.98For 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 $199.99Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
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 A9 Ultra | KeenPower SC6000 Pro Supercapacitor |
|---|---|---|
| Overall rating | 4.0/5 | 3.9/5 |
| Value 40% | 71 $199.98 for its size | 71 $199.99 for its size |
| Features 35% | 80 manual override, rated to -4 °F, USB-C charging | 80 manual override, rated to -45 °F |
| Capacity 15% | 75 99.9 Wh battery | 50 capacity not published in Wh (neutral score used) |
| Warranty 10% | 25 1.5-year warranty | 50 warranty not published (neutral score used) |
| GOOLOO A9 Ultra | KeenPower SC6000 Pro Supercapacitor | |
|---|---|---|
| Starting | ||
| Rated engines | all gas, 12 L diesel | all gas |
| Peak amps (maker) | 6,000 A | 6,000 A |
| Cranking amps | 480 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 | 99.9 Wh | - |
| Capacity (mAh) | 27,000 mAh | - |
| USB-C input | 100 W | - |
| Recharge time | 1.5 hours | - |
| USB outputs | USB-C 100 W, USB-A 5 V/2.4 A | - |
| Build | ||
| Flashlight | Yes | - |
| Air compressor | Yes | No |
| Dimensions | 11.4 x 6.49 x 3.18 in | - |
| Weight | 4.8 lb | 11.5 lb |
| Warranty | 1.5 years | - |
| Released | 2026-09 | 2024-04 |
