Clarke JSM300 Multifunction Micro Jumpstart/Portable Device Charger Power Pack 500A(12AH) JUMPSTART-MICRO.

Product Information

It dispatched our tests with ease, still showing four LEDs and able to power up phones and tablets for some time. There are ways of making sure your car is ready for winter and preparing it for the freezing weather ahead. The Clarke 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 while also including a 12-Month Manufacturer's Warranty.

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. A torch was fitted in the end of the jump start, pointing directly at the clamps, although there were no flashing modes as on the MSC. We logged battery state at the end and rated each starter for practical features such as cable length and clamp size, tech spec and weight. At 573g, it is impressively light and we like the fact that, over four sockets, it can power and charge 5, 9, 12 or 15V devices. Salt applied to the roads in winter rapidly accelerates corrosion on a car, and parts that are out of sight can develop a coating of rust surprisingly quickly.Like the Ring RPPL300, its cover is a bit awkward, but once connected, it did the job well, producing up to 65A, but with just three (of four) LEDs lit at the end. Most drivers will have an ice scraper and can of de-icer already, but now is the time to dig them out from the shed so you’re not left using a credit card to clear the screen when caught out while away from home. This heavy duty booster from SIP has been designed to easily and quickly jump start engines, with the 12/24V internal battery voltage and high cranking rate.

If you need the extra Ah for a larger engine or diesel, or for powering many devices, this is the one for you.

The test-winning Powerlantz also has a bright work light, so it can help you fix problems by the roadside. We liked the large, tough zip-up case and the high-quality feel of the device, which had the battery connector, USB and charging sockets protected by a flexible rubber cover.