NOCO Boost Plus GB40 1000A UltraSafe Car Battery Jump Starter, 12V Jump Starter Battery Pack, Battery Booster, Jump Box, Portable Charger and Jumper Cables for 6.0L Gasoline and 3.0L Diesel Engines

The NOCO Boost Plus GB40 uses high-discharge lithium technology inside a rubberised over-moulded shell that resists scratching surfaces it rests against. The enclosure is water-resistant to IP65 and the whole unit weighs 2.4 pounds.

Rated at 1000 amps, it jump starts 12-volt batteries in gasoline engines up to 6.0 litres and diesel engines up to 3.0 litres. Spark-proof technology and reverse polarity protection guard against incorrect connections. A 100-lumen LED flashlight offers seven modes, including strobe and SOS, and the internal pack charges USB devices.

One charge covers up to 20 jump starts and holds for a year in storage. Recharging takes 3 hours at 2.1 amps. Ships with clamps, a 12-volt car charger, Micro USB cable, microfibre bag and user guide.

To get the best result when jump starting, connect the red clamp to the dead battery's positive terminal first, then the black clamp to an unpainted metal ground on the engine block rather than the negative terminal itself. Once connected, turn the unit on and wait a few seconds before cranking the engine. After a successful start, disconnect in reverse order. The LED indicator on the unit shows the remaining charge level, so it is worth checking this before a long trip and topping it up if needed. The Micro USB input means you can recharge it from a laptop or wall adapter you likely already own.

For storage, keep the pack between roughly half and full charge, away from direct heat such as a glove box in summer, which shortens lithium cell life. At 2.4 pounds it fits comfortably in a boot bag or under a seat. This size suits drivers of everyday passenger cars and light vans rather than large commercial diesel vehicles. When comparing jump starters in this category, peak amp ratings can be misleading because sustained cranking amps matter more in cold weather, so the 1000-amp figure here is a useful reference point rather than an absolute measure of cold-start performance.