mucklestone

I don't drive my TF much so always disconnect the battery. Not had an issue yet, even when left for months.

However you would have to lock the car manually and the alarm would not work.

I'd be more worried about brakes sticking on. I leave them off but that's in a locked, flat garage with tyres in tyre savers. Would be irresponsible outside - there are stories of cars rolling away when kids nick the brick from under the wheels.