Yes, many standalone sump pump high-water alarms operate on standard 9-volt batteries or rechargeable lithium battery packs, allowing them to function independently during power outages when electrical grid failures occur. Some advanced smart alarm systems also use battery backups to send remote Wi-Fi alerts or text messages to your smartphone if water levels rise while you are away from home. Verification: Test the battery backup feature by pressing the test button on the alarm unit while it is unplugged from wall power.
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