Sinclair C5 major consumer organisations published sceptical evaluations. The Automobile Association questioned many of Sinclair's claims in a report published at the start of May. It found that the range of the vehicle was typically only about 10 miles (16 km) rather than the promised by Sinclair, and reported that the C5's battery ran flat after only on a cold day. The C5's running speed was more usually around than the claimed , while its running costs compared unfavourably to that of a petrol-driven Honda PX50 moped. The stability, general roadworthiness, and especially the safety of the C5 were questioned, and the
Sinclair C5 dry in the vehicle's open cockpit. Other accessories included seat cushions and spare batteries. Sir Clive Sinclair's interest in the possibilities of electric vehicles originated in the late 1950s during a holiday job for the electronics company Solatron. Fifteen years later, in the early 1970s, he was the head of his own successful electronics company, Sinclair Radionics, based in St Ives in Cambridgeshire. He tasked one of his employees, Chris Curry – later a co-founder of Acorn Computers – to carry out some preliminary research into electric vehicle design. Sinclair took the view that an electric vehicle needed to be