Clore Automotive JNC660 vs GOOLOO GT4000S
Clore Automotive JNC660
The short answer
GOOLOO GT4000S comes out ahead overall with 7.3/10 against 6.6/10 for the Clore Automotive JNC660. Clore Automotive JNC660 is stronger on starting power, build quality & durability and battery safety & sustainability. GOOLOO GT4000S is stronger on battery capacity & standby, ease of use & safety features, versatility and value. At current verified prices, the GOOLOO GT4000S costs about $26.06 less.
- Choose the Clore Automotive JNC660 if: Farms, shops and fleets that need long, repeated glow-plug cranks and can keep an 18 lb box on AC charge.
- Choose the GOOLOO GT4000S if: Diesel pickup owners on a budget who want a light 4,000A pack and can keep it topped up and warm.
Scores by criterion
| Criterion | Clore Automotive JNC660 | GOOLOO GT4000S |
|---|---|---|
| Starting Power | 8.0425 cranking amps of sustained current; Outdoor Life says up to a 350 diesel; spec-based | 7.54,000A; Outdoor Life recommends it for 3/4-ton diesels; diesel rating conflicts between 8L and 10L |
| Battery Capacity & Standby | 5.022Ah SLA; recharge after each jump | 6.0No published or measured Wh; -4°F floor; 3-month top-up advised |
| Ease of Use & Safety Features | 6.5Simple with long heavy cables, but 18 lb and AC-charge only | 7.5SuperSafe protections, PopSci's Best design, 2.3 lb |
| Build Quality & Durability | 8.0Pro-grade shop box with a replaceable battery | 6.5IP65; some anecdotal reports of units that stopped charging |
| Versatility | 3.0No USB, light or compressor | 7.5100W two-way USB-C PD |
| Battery Safety & Sustainability | 6.5Lead-acid is recyclable and the battery is replaceable, but it contains lead | 5.0Li-polymer; no certifications named on the product page |
| Value | 7.0$126 is fair for a pro shop box | 8.8About $100 for a diesel-capable pack recommended by independent outlets |
Specifications
| Spec | Clore Automotive JNC660 | GOOLOO GT4000S |
|---|---|---|
| Peak Current | 1,700 A | 4,000 A |
| Battery Chemistry | Sealed lead-acid (AGM) | Lithium polymer |
| Weight | 18 lb | 2.3 lb |
| Built-in Air Compressor | No | No |
| Max USB Output | — | 100 W |
| Water/Dust Rating | — | IP65 |
| Min Operating Temperature (rated) | — | -4 °F |
| Automatic Cell Preheat for Extreme Cold | No | No |
Clore Automotive JNC660
Pros
- Sustained cranking current for hard starts
- Heavy 46-inch #2 AWG cables
- Replaceable battery
- Built-in automatic charger
- Moderate price
Cons
- 18 lb and not portable
- Charges only from 120V AC
- Must be recharged after each jump
- No USB or light
The practical choice for shops, farms and fleets with diesels that need repeated cranks and a place to plug in.
Full Clore Automotive JNC660 review →GOOLOO GT4000S
Pros
- Very low price for 4,000A
- Light at 2.3 lb
- IP65
- 100W USB-C power delivery
- Outdoor Life's pick for diesel trucks
Cons
- Conflicting engine ratings on the maker's page
- No Wh figure or certifications published
- FAQ advises recharging every 3 months
- Some owners report units that stopped charging
A sensible budget pick for diesel pickups if you keep it topped up and warm. It trades documentation and certainty for price.
Full GOOLOO GT4000S review →Both products are part of our guide The Best Jump Starters for Cold Weather & Diesel Trucks of 2026, where you can see every pick, how we score and current prices from each retailer.