Ring PowerPack 135
Price: £109 Lead length: 86cm
Looks virtually identical to the Halfords, and features a similarly generous specification, too. That means you get a 300-watt power inverter, two fluorescent tubes and a very smooth-sounding air compressor built-in. Plus, the boost performance was excellent. What lets the Ring down is the price; it costs £35 more than its chain store twin, which is hard to justify.
