..... I am assuming you are thinking the same thing, but be sure to get a "FLOAT" charger, not a "TRICKLE" charger.
http://en.wikipedia.org/wiki/Trickle_charging
oh....and I just bought a redtop about 2 weeks ago... Part Number: 25
I think YELLOW tops are supposed to be able to be deep discharged without affecting the battery....could be wrong though.
I use the Battery Tender Junior 12V @ 0.75A for both my Mitsubishi Spyder and my Yamaha R6. Both are winterized every year