Optimate O-115 USB charger £24.99

Tested by Martin FitzGibbons for three months

This widget turns the DIN 12-volt socket on BMWs, Triumphs and Ducatis into two high-powered USB ports. The two slots are set 90 degrees apart. That’s useful when you’re charging only one gadget, letting you pick the most convenient slot. Another neat feature is auto-shutoff – preventing battery drain. Quality ★★★★★ Value ★★★★★ www.optimate.co.uk