We have a situation in the family where a car may sit for several months. This car is generally not near an AC source as it is parked at a condo. I know the best thing is to disconnect the battery, but that isn't really an option. I'm thinking a solar battery maintainer like this would do the job well. Couple that with the cigarette lighter adapter (pretty sure the power plug is hot 24/7, need to check that) and it should be a very simple setup and prevent the situation that we have right now, a super dead battery that probably cannot be saved. Anyone have experience with the solar ones?