The KeenPower SC6000 Pro Supercapacitor is the better jump starter overall, rated 3.9 to 3.3. The KeenPower SC6000 Pro Supercapacitor leads on value. The NOCO Boost X GBX155 wins on features. The KeenPower SC6000 Pro Supercapacitor costs $169.96 less ($199.99 vs $369.95).
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 $199.99For heavy-duty trucks, diesels, boats and fleets that need the most starting power in a lithium pack. Most car owners will be well served by something smaller and cheaper.
Amazon $369.95Prices 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.
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 | KeenPower SC6000 Pro Supercapacitor | NOCO Boost X GBX155 |
|---|---|---|
| Overall rating | 3.9/5 | 3.3/5 |
| Value 40% | 71 $199.99 for its size | 23 $369.95 for its size |
| Features 35% | 80 manual override, rated to -45 °F | 90 manual override, rated to -4 °F, USB-C charging, IP65 |
| Capacity 15% | 50 capacity not published in Wh (neutral score used) | 74 99 Wh battery |
| Warranty 10% | 50 warranty not published (neutral score used) | 0 1-year warranty |
| KeenPower SC6000 Pro Supercapacitor | NOCO Boost X GBX155 | |
|---|---|---|
| Starting | ||
| Rated engines | all gas | 10 L gas, 8 L diesel |
| Peak amps (maker) | 6,000 A | 4,250 A |
| Voltage | 12 V | 12 V |
| Manual override | Yes | Yes |
| Lowest operating temperature | -45 °F | -4 °F |
| Battery and charging | ||
| Chemistry | Supercapacitor | Lithium-ion |
| Capacity | - | 99 Wh |
| USB-C input | - | 60 W |
| Recharge time | - | 2.7 hours |
| USB outputs | - | USB-C 60 W, USB-A 10 W |
| Build | ||
| Flashlight | - | Yes |
| Air compressor | No | No |
| Water resistance | - | IP65 |
| Dimensions | - | 12.03 x 6.89 x 2.72 in |
| Weight | 11.5 lb | 5.8 lb |
| Warranty | - | 1 year |
| Released | - | 2021-11 |
