Have you considered getting a power inverter such as a Heart freedom series. They have a good three stage charger built into them,when you plug your boat in the charger is instantly in opperation. If you don''t presently have a power inverter aboard your boat, I think you would find it a very usefull upgrade to your boat.
Glad to see that I''m not the only one in love with AGMs! I have two banks of Lifeline GPL-4Cs... Anyway, I think the Heart Charger/Inverter is a good choice because you never know when you''ll need AC on board. Plus, they seem to be pretty durable.
My uncles 3 month old boat had all navigation electronics zapped by a near miss of lightning, and while the computer, Autopilot, etc. were out of commission, the Heart Inverter/Charger soldiered on.
Just be sure to set the charge points right and to disable equalization (some chargers do this automatically)