my 07 HD is in storage and the battery which is a redtop Optima keeps dying. I have someone go start it up and drive it around every week or 2 but sometimes they have to jump start it. There is no outlet in the storage so i can't use a trickle charger.....Any other options? I don't wanna unplug the battery or anything like that. If i have to keep it the way it is i will but i'm just trying to make something better