Jump starters · Product spotlight
NOCO GB40: keep a jump starter ready for the unexpected
A compact starting pack for compatible 12V vehicles. Battery chemistry, engine size and storage conditions matter.
Researched
Our recommendation
Consider it for emergency starting assistance with a compatible 12V lead-acid vehicle battery. Check the vehicle’s instructions first and treat the pack as backup equipment that needs periodic charging.
Current listing includes clamps, a USB-C charging cable and storage bag. Older GB40 stock and support material may show Micro-USB.
- Battery compatibility
- 12V lead-acid vehicle batteries
- Peak starting current
- 1000A
- Engine ceilings
- Up to 6.0L petrol / 3.0L diesel
Affiliate links may earn us a commission. Check the exact variant and current price. Specifications are manufacturer claims, not our own test results.
Check the vehicle, not just its engine
The pack is intended for 12V lead-acid batteries. Confirm the actual battery chemistry and the vehicle maker’s jump-start procedure, including any designated connection points. Engine capacity alone does not establish compatibility.
A car with unusual electrical architecture needs its own guidance. Do not assume that an electric vehicle, hybrid or lithium replacement battery is supported just because another part of the vehicle uses twelve volts.
Treat the headline as a limit
The 1000A figure is peak starting current, not continuous output. The stated petrol and diesel engine sizes are ceilings under suitable conditions. Battery damage, temperature and the condition of the starter system can change the outcome.
A successful start does not explain why the battery went flat. Repeated problems need investigation, particularly if the vehicle is used infrequently or has a charging-system fault.
Prepare before a breakdown
Fully charge the pack before relying on it and keep the clamps and instructions together. Check the charge periodically and after use. Practise locating the approved jump points from the vehicle manual while the car is safely parked.
Keep the pack accessible without leaving it loose where it can move during driving. Store it indoors when not in use, as directed by the manual, and avoid a permanently hot place in direct sunlight.
Know where protections stop
Normal operation includes reverse-polarity and spark protection. Manual override disables safety measures and should not be presented as a routine shortcut. If the pack cannot detect a battery, follow the documented troubleshooting or seek assistance.
Do not attempt to start a damaged or frozen battery. Use the product and vehicle manuals for the actual procedure; this buying guide does not replace those instructions or a trained assessment of an unsafe battery.
Check the charging revision
The current listing and manufacturer specification describe USB-C charging. Older GB40 support text still mentions Micro-USB, so inspect the supplied unit and cable before packing a spare. A USB connector change does not imply high-power laptop charging.
The light and modest USB output can be useful during a breakdown, but drawing on them reduces the energy reserve. We have not tested starting performance; buy against the documented compatibility and maintain the pack between trips.
Technical details
Specifications and compatibility.
| Specification | Details |
|---|---|
| Battery compatibility | 12V lead-acid vehicle batteries |
| Peak starting current | 1000A |
| Engine ceilings | Up to 6.0L petrol / 3.0L diesel |
| Model | GB40; current listing advertises USB-C charging |
| Internal battery | 24Wh lithium-ion; distinct from the supported vehicle chemistry |
| Charging input | USB-C, 5V / 2.1A maximum on current specification |
| USB power output | 5V / 2.1A maximum |
| Typical recharge reference | Approx. 3 hours with a suitable 2A source; actual time varies |
| Flashlight | 100 lumens |
| Light controls | Multiple modes including steady light, SOS and strobe |
| Protection | Spark-proof and reverse-polarity protection in normal operation |
| Manual override | Disables safety protection; consult the manual rather than using it routinely |
| Housing rating | IP65; follow dry-use and storage guidance |
| Dimensions | 196 × 80.3 × 43.5mm |
| Weight | Approx. 1.11kg |
| Operating range | −20–50°C |
| Charging range | 0–40°C |
| Storage range | −20–50°C; keep out of direct sunlight and excessive cabin heat |
| Included accessories | Heavy-duty clamps, USB-C cable and microfibre storage bag |
| Excluded use | Not for 24V systems or unsupported vehicle-battery chemistries |
| Function limit | Starting aid; not a battery repair tool or continuous mains charger |
A good fit if…
You have a compatible vehicle and want a portable starting aid that you are prepared to check, recharge and store correctly.
Keep in mind
It cannot repair a failing battery. Vehicle compatibility comes first, and manual override removes safeguards. Engine-size ratings are not a guarantee of a successful start.