There are many ways to install two batteries and lots of opinions on which is best.
First, try a web search for battery isolators.
There are also various devices that can disconnect any load when the voltage on a battery gets low like some of the PC dc-dc power supplies do. I can't think of a particular one to look for or the generic name, but searching for battery monitor or something like that will probably turn something up.



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when the voltage goes low?
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