Much depends on what you do with the battery. Physically disconnecting goes a long way, trickle charge even further. But street parking and serious mothballing don't go well together, particularly when you never know ahead of time wether your next drive will be tomorrow or next year. There are cheap solar trickle chargers that supposedly solve the problem for street parking, but modern car electronics often require some rewiring to hook them up. In the end it's not an unsolvable problem, but a strong motivator to give in to reason and just take a rental when needed.