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In response to "Yes. That's crazy. I had a sump pump installed (no battery backup) in 2020 for $720 by Black Diamond -- nm" by oblique

The battery is definitely more expensive than the sump pump, but even if you double your price it's a bargain relative to their offer. I would

suggest you consider the back up though. If it's raining hard enough to need the sump pump there is a non-zero chance you're going to lose power too.

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