Outside storage: I do not have a garage so I keep my bike under a canvas cover. I attached a solar tender, here is a picture of it. Because of the nasty weather here in New Jersey I haven't been on my bike for 12 days. I went out today, detached the tender and it fired right up. (-: I should mention that I carefully enclosed the entire solar panel in clear plastic wrapping to protect it from rain and snow. It is pretty much watertight.