I have two sump pumps (two separate pits at opposite ends of the house) in my house. I want to add two battery backup sump pumps. I've read mixed reviews on the Watchdog pumps at Home Depot and Lowes. I don't want something where I have to add acid or water to the batteries on a regular basis.

Can anyone recommend a reliable brand? Nothing too expensive, as I need to buy two of them.

Thanks,
Ed