Not sure whether i might have the wrong end of the stick, was thinking you were wanting to keep your batteries fully charged while she's parked up at home, if this is the case then a conditioner (ink they are actually called tenders) will intelligently keep it topped up perfectly without risk of damage, they are really small units and have a set of connector plugs you add to the battery permanently to make connecting up a plug in exercise. The one problem is that they won't charge a completely flat battery I leave my celiac on it all winter, summer time she fires straight up. Here's a Link to the thing I've got, mines similar to the 800 one that says. 'keeps your childs ATV fully charged' not sure why it says that, works a treat in my car. There's a good one on there that wil do two at once, good for leisure battery also and think that will charge from flat too.
http://www.google.co.uk/search?q=battery+tender&ie=UTF-8&oe=UTF-8&hl=en-gb&client=safari#q=battery+tender&hl=en&client=safari&tbo=u&source=univ&tbm=shop&sa=X&ei=KlIBULTwLKqb0QW6pKGyBw&ved=0CHQQrQQ&bav=on.2,or.r_gc.r_pw.,cf.osb&fp=a8fdb1bc2c37b121&biw=1024&bih=690
Hope this helps
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