Hows about individual dealers offering a battery hire service for their customers for when they wish to complete longer distance tours? A reasonable refundable deposit and daily hire could be charged and a battery prebooked in advance. Those dealers with multiple sites could offer a variety of pick up and drop off places. This would also increase showroom visits where the latest models are on show and some may be tempted to upgrade. So is there any mileage in this idea or is it a non starter?