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That depends on what brand alarm system you have. If it is a hardwired alarm system and you have never lost power to your home, it should last five years. If it is a wireless system or if you have lost power a few times then its about three years.

Most battery backups are hard wired meaning they do not require changing. You can verify your type and when to change them with the system manufacturer.

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Q: How often should I change the backup battery in my electronic security system?
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