I use a couple of these Sears DieHard charger/maintainers that work very well.

Sears: Online department store featuring appliances, tools, fitness equipment and more

They appear to be made by Shumacher and look like the 1462A, but they have a higher charge amperage of 2 amps. In addition, they have the clamps, o ring connectors, and 12V accessory plug.

I picked up both of mine when they were on sale under $20.00.