House batteries could be 12 volt or 6 volt. If they are twelve volt, connect them in parallel (+ to + and - to -). If they are 6 volt, connect one battery + to - on a second battery, now that set is the same as a 12 volt battery. If you have four 6 volt batteries, you now connect the two "sets" in parallel. The open + terminal to the other open + terminal, and then connect the two open - terminals together.
Hope that isn't confusing...
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