Ok, so I see the Zipcar system is set up quite differently to the car sharing I've used elsewhere. Here, there are many more cars, but it's not possible to res

Ok, so I see the Zipcar system is set up quite differently to the car sharing I've used elsewhere. Here, there are many more cars, but it's not possible to reserve far in advance. You can reserve for free for enough time to walk to the car (20 minutes?) or pay to reserve for longer. The charge state is shown prominently.