Sorry, eamartin. I just now read your post of nearly 4 months ago. You probably have already learned about the HF Float Chargers by now, but on the chance you haven't, here goes: You can usually pick-up a HF Float Charger, with a coupon, for between $5 - $7 bucks. They work very well on small batteries, like lawn mowers, ATV's scooters and m/c. They will not charge a dead battery, but will keep a good, charged battery at full charge and will actually make your battery last longer. They WILL NOT over charge. I keep one on all my toys 24/7 when not in use. They last forever if not dropped on a concrete floor. As far as I can see they do the same thing as a Battery Tender, but cost far less. I can recommend them.