CA Traveler wrote:
The batteries have loads that cannot be switched off which kills the batteries over time. Fully charge the batteries then remove the negative battery cables when storing. Mark and take pictures first. In 6 months the batteries should start the engine or gen w/o a issue.
I'd start the gen first and let it run for a hour assuming the charger charges both banks.
Also, the gen may not direct charge and trickle charge will not charge a depleted battery. With gen running it will still take up to 30 minute, with the boost/crossover switch engaged, to bring the chassis up to a state that it will start your engine.