If a car with fully charged battery won't start after just two weeks then the battery needs replacing due to its diminished capacity.

Smart battery chargers/conditioners left on float charge 24/7 will help prolong battery life but will eventually mask the reduced capacity - being the usual form of battery degradation. You could then become stranded following the first overnight away from home and charger.


2018 Roadster - Red/Magnolia - "Morton"
1966 Land Rover series 2a SWB
1960 Velocette Venom