By Victoria Waldersee BERLIN (Reuters) – Chinese electric vehicle maker Nio will only lease its cars when it launches in four European markets this year, its CEO told Reuters on Friday, betting that flexibility will be a key selling point as drivers switch to the new technology. Users will be able to lease a car with a 75 gigawatt hour battery for 1,199-1,295 euros ($1,171-$1,264) a month depending on the length of the subscription, which can be as short as a month. The plan is the latest unconventional move by the company, which already allows customers to rent rather than buy the battery – t…