Most impressed with my solar panel battery maintainer. It is a simple rig that mounts on my shed door and runs to the bike's battery with the provided pig-tail attachment. I bought it at Canadian Tire for 10 bucks...(regular 29.99). No electricity needed and the bike cranked over as fresh as a daisy. (It's been laid up from November till now, March). I started it twice, today being the second time. The panel maintains the battery, it doesn't charge it so the battery must be in good shape when you store it. That being said, it does a great job and I highly recommend it for those that don't have an electrical hook-up in their shed or garage. We've had a brutal winter here on the East Coast and I know if that gizmo wasn't working my battery would have been TOAST. Thought I'd write a quick review extolling it's virtues.