Advice please forum peeps. I will have to leave my Z4 for 3.5 months without use and want it to be alive when I return. There is no electricity supply in the communal garage where the car will be kept so trickle chargers are out. Either I can lock it down and hope for the best or disconnect and remove the battery, shut the boot manually and leave it locked but not alive. On return I would charge the battery for a day, install it and then fire it up. Of course, i will need to open the door with the key and then use a power pack on the engine bay terminals to open the boot. i will probably also have to sort the clock and other manually adjustable things. Will this work? Any better ideas from any who might have had to suffer this? Thanks!