Your Battery Dies at 11pm in a Parking Lot. Do You Want Jumper Cables or Something That Works Without Another Car?
Jumper cables require a running car in the right spot. In a parking garage at 11pm, in a remote trailhead, in a rainstorm — there may not be another car. The NOCO GB40 is a lithium battery jump starter: you charge it at home, put it in your glove box, and when your battery dies, you connect it to your battery and start the car yourself. No other vehicle required.
5,752 buyers have reviewed this product. The dominant themes are: it worked when the battery was dead, it was easy to use, and they were glad they had it. The spark-proof clamps and reverse polarity protection make it idiot-proof — if you connect the clamps wrong, nothing bad happens, it just won't work until you fix it.
NOCO Boost Plus GB40 1000A Jump Starter
Is This Page For You?
- ✓Works without a second car — charge it at home, keep it in your glove box, use it anywhere
- ✓Spark-proof, reverse polarity protected clamps — connecting them incorrectly won't damage your car or the device
- ✓1000A handles 6-cylinder gas engines and 3L diesel — covers most sedans, SUVs, and light trucks
- ✗Not for 8-cylinder trucks or diesel vehicles over 3L — those need the GB70 (2000A). Check your engine size before buying.
Specs at a Glance
| Peak Current | 1000A |
| Engine Compatibility | Up to 6L gas, 3L diesel |
| Battery Type | Lithium-ion |
| Charging Input | Micro-USB (note: older port) |
| Output | USB-A for device charging |
| Safety | Spark-proof, reverse polarity protection |
| Weight | ~1 lb |
What 5,752 Verified Buyers Report
The pattern in reviews: buyers who had written off their battery and called a tow truck instead first tried the GB40. Multiple report starting cars with batteries showing 0 volts. The jump-start works by briefly overpowering the dead battery, not by charging it.
Reverse polarity protection is cited by non-mechanical buyers as the feature that gave them confidence. The device won't spark if you connect wrong. Multiple buyers describe connecting it incorrectly, getting a warning beep, reversing the clamps, and starting their car.
Several buyers mention charging phones and tablets from the GB40 during power outages and camping. It functions as a portable battery pack when not jump-starting.
Frequently Asked Questions
Check your engine displacement (liters). GB40 handles up to 6L gas and 3L diesel. Most passenger cars, crossovers, and light SUVs are under 4L gas. V8 trucks (typically 5.0–6.2L) are at the edge of GB40 range — for those, use the GB70 to be safe.
NOCO states it holds a charge for up to 1 year in storage. Real-world buyer reports suggest checking it every 3–6 months and topping off the charge. The lithium-ion battery does self-discharge slowly over time.
Jumper cables require a running vehicle in proximity. The GB40 works alone, anywhere. At the price of one tow truck call, you own it forever. The math works out.
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