Clarke Heavy Duty Jump Start 4000

It's certainly ‘heavy’ duty, tipping the scales at 17kg. The Clarke is also the most expensive product here, and comes with very long leads (120cm), plus a battery rated at a mighty 38Ah. There’s no doubting its technical ability, and it would probably start a truck, but extras are limited to an isolator switch, 12V socket and a simple light. Despite its size, it doesn’t justify the hefty outlay.