The JSM400 Jumpstarter is supplied with a zip fastening bag, AC battery charger, smart charging cable, switch cable, 3 way USb cable, car charger adapter and 8x notebook adaptors.

Our favourite in recent tests was the Clarke JSM300, which performed well in the vehicle jump start assessments, but also included a variety of adaptors to power other accessories. If you live in areas where the temperatures regularly plunge, it might be worth choosing dedicated winter tyres. These are a legal requirement in some European countries, because they make such a difference to safety in the colder months. Our favourite breakdown warning devices go one stage further, adding flashing lights to make them even more visible. The test-winning Powerlantz also has a bright work light, so it can help you fix problems by the roadside.

USB output with 4-way device adaptor cable; including iPhone Lightning, USB C and Micro USB outputs to suit most mobile phone connectors

With a whopping 18Ah on tap, the Plus version of MSC’s winner barely flinched at our starting tests, finishing with the battery state still at 100 per cent. Presented in a hard, zipped case, it’s dust/waterproof to the IP65 standard and comes with chargers for mains, USB and car. In addition, it has eight adaptors for charging a laptop; one worked well on our HP. It seems mean to have just one USB, but it has a multi-way cable to make life easier. Massively capable, if heavy, at 919g, this device can do almost everything. All perform well and our top four are particularly closely matched. The brand-new MSC just edges out the JSM300 Clarke, with Sealey’s recently launched RS600 chasing the leading pair hard. We tested Muc-Off’s HCB-1 and it did a good job of warding off corrosion for several weeks, or Ferrosol’s UB products will provide longer-term protection. Lithium ion batteries with very low charge cycle requiring only approx 6monthly recharge if not used Our tests include putting the blades in a freezer overnight to ensure they stay supple in cold weather, and the Bosch Aerotwin came out on top.If you break down at any time of year, it may put you and other road users at risk. But the danger is even greater in the dark and gloomy winter months. Internal 12V 18Ah Sealed lead acid battery, with mains powered charger and 12V charger lead for in-vehicle charging. For our starting test, each device had to assist an ailing battery on a 1.6-litre petrol engine, turning it over five times for five seconds, with two minutes in between attempts. Multi-function charge and start modes make the WBC180 a versatile piece of kit for any workshop or garage. Device is compatible with 12V and 24V lead acid batteries, with a capacity of up to 500Ah.