For your house batteries question. Do you already have existing batteries and need to replace? Or is the battery compartment empty and you need to know what to put in there?
If you have existing batteries I would first try to determine if you have 6 volt or 12 volt batteries.
Hopefully the voltage is plainly marked on the batteries. But if not you can count the caps on top of the battery used for adding distilled water. Each cap is a 2 volt cell. So 3 caps per battery = 6 volts and 6 caps per battery = 12 volts.
For replacement batteries (both 6 and 12 volt) I find the best prices at Costco.
