I got 5 little Vector 2 amp chargers. They're small enough to fit under the floor of the seat compartment around the topmost battery. They come with ring connectors that can be screwed onto the battery terminals. I will drill holes in the seat compartment floor to let the heat out. I'm hoping this setup works so I can bank charge the batteries at work. I can arrange them so the red, yellow and green led's on the side all show. Here a pic on how they will fit.