The same is true for any vehicle that is stored, you don't put a vehicle in a garage for months at a time and figure it will be ready to use on demand, even storing my motorcycles over winter, the batteries get put on a charger or they get started up every few months! I even have a computer UPS battery pack/inverter so I can top off the charge on my electric car in case it's being stored in the one shed without electricity.
Then again, people don't like to read owners manuals.
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