Mpolli - I like idea #2. All I need to do is put a clamp on each wire and clamp it to my battery. Might buy that one. However, I assume my battery is a NiMH or NiCD and that the scooter charger is for a lead acid battery. So would the charger you recommended work ok on my nickel battery?

How would I wire two battery charges together in series? Does it require getting into the guts of one of the chargers?