Your battery is flat and there is no second car in sight: that is exactly what jump starters are for. The NOCO Boost Plus GB40 is a compact lithium device for 12-volt vehicles and does not need jumper cables to another car.
What it can do
- 1,000 A peak current at 12 V.
- For petrol engines up to 6.0 L and diesel engines up to 3.0 L displacement.
- Spark protection and reverse polarity protection (UltraSafe) in normal operation.
- USB output, for example to charge a phone, and an LED flashlight.
- About 1.1 kg and roughly 19.6 × 8.0 × 4.3 cm (according to retailer information).
Who is it for?
For commuters, occasional drivers and anyone who doesn't want to wait for help in winter. Also handy if there are several vehicles in the household, such as a car, boat or motorhome (according to the manufacturer).
What to look out for
- Compare your engine's displacement with the limits, ideally using your vehicle registration document.
- For 12-volt systems only. It is not intended for 24-volt systems, which many trucks use.
- Check the charge level now and then so the device is ready when you need it.
- Despite the protection features, read the manual and connect the clamps correctly.
Verdict
A compact jump starter can sort out a flat battery quickly, without relying on strangers for help. Before buying, just check your engine size and your vehicle's system voltage.
Information based on manufacturer and retailer details, as of 11 Oct 2026. We do not run our own hands-on tests. This article may contain affiliate links (ad).