My wife and I are going to be out of town for 2 months, and one of our cars will be staying home and not getting much driving. We have a Black and Decker Battery Maintainer that we were considering using to keep the battery fully charged. Unfortunately, we don't have an enclosed garage: we can park our car under our back porch, so it won't be fully exposed to the elements, but it's not hermetically sealed either (and this is Virginia during the summer, so some heavy rains are unavoidable). We don't have an actual all-weather cover for the car, but could cover the charger with a tarp.
How seriously do we need to take the warnings in the manual to not use the charger in the rain? How bad would it be to have the charger on the ground?
The other option would be just letting the battery sit, and hooking up the charger when we get back, which I have to admit sounds more reasonable to me, but I know could lead to some battery damage.