I would suggest the Battery Minder. It will keep the batteries topped off while you away. Chances are they will not use much water but someone should check every month or so.
I would call Jerry at 352-205-0092, he will set you up and enjoys explaining everything.
If you do not wish the expense of the BM (maybe $200), then I would disconnect the battery pack and get them charged at LEAST 3 times during that period by whoever looks in on your home. This number varies depending how quickly the pack discharges.
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