If the car is being stored for 3 months,then I would disconnect the battery.Just remove the earth lead.This will ensure there is no battery drain.If it is an original gel type battery,then it could be a Panasonic make.I would use a Ctek charger.As for the car cover,I would be careful to ensure it is a good quality breathable fabric,otherwise you could end up with damaged paintwork from sweating/bubbling.I leave my MX5 outside with no cover,and no problems.Just rinse down the hood a few times to prevent build up of crud/mould.
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