Whatever the arguments for and against electric cars, this is a good idea. The key concerns for electric vehicle owners are battery longevity, and so-called 'range anxiety'. Leasing the batteries resolves both these issues. However, whilst the change may take 'only 3 minutes', getting to the fitting station and waiting your turn may make this a more prolonged activity.
After all, it takes only 8 seconds to change 4 tyres in F1, but at my local tyre centre I usually manage to read all of the (worthwhile) newspapers, drink at least 4 cups of coffee, have a cat nap, reply to my emails, read a dog-eared copy of Autocar, phone the wife to tell her how bored I am, phone the girlfriend to tell her how bored I am with the wife, and cancel all of my afternoon appointments. If I'm having the exhaust changed, I also take a sleeping bag. Last time they took four hours, and changed the wrong part!