For years we used to go to Western Australia for 12 weeks, Jan, Feb, March and the car stood in the drive throughout that time often covered in snow. The battery was 10 years old. It never once failed to start the first time on our return home.
We left our car for seven weeks back in February-March 2018 whilst we toured Australia and New Zealand. It sat untouched through one of the worst winters the UK has suffered for a while, including the 'Beast From The East'. It started first time.