Posts: 3479
Location: Elk River, Minnesota | Hiya,
A battery is an interesting thing. When fully charged, the liquid within the battery is not water, but an electrolyte. Due to this it has a much much lower freezing point than regular water.
With this in mind, what you can do is unhook the batteries from the various components they provide power to, and the battery will not lose charge. What many do if the have the onboard charger is keep the charger leads on, then top off the batteries once a month by plugging in. This is more of a preventative maintenance step than anything, ensuring the batteries are kept at full charge.
A recommendation by many, though is to NOT keep the charger plugged in all the time. The reason being that if for some reason the charger fails somehow, the battery could get over charged, thus a potential for explosion, damage, what have you...
In a nutshell, top the batteries off, unhook all electrical items that draw power from them, and recharge for a couple hours once a month. Your batteries will appreciate it. 
Steve
Edited by VMS 11/14/2014 11:36 AM
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