I have an exterior sump pit which gets all the water from my downspouts and french drains and pumps it out to a rain tank and overflow into a leeching field.
Because of where the pit is, if the pump were to fail or the power went out during a big storm, the water would overflow into my downstairs.
I've seen plenty of battery back-up sump solutions online, but it's not clear to me if any of them can work in an exterior application. If I get a marine battery and put it inside the provided plastic enclosure, am I good? Is there special equipment for an exterior application?