Replacing a specialized deep-cycle backup battery for a sump pump system typically costs between $150 and $300 for the battery unit alone, depending on whether you choose a standard wet-cell marine battery or a maintenance-free AGM (Absorbent Glass Mat) battery. If you hire a professional plumber or waterproofing contractor to supply and install the new battery, total costs can range from $250 to $450 including service labor fees. Verification: Test the new battery using the test button on your backup system control panel to ensure it holds a proper charge.
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