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It's important to keep your home security system working properly. Which is why it is essential to keep a working alarm battery in your system. Here a few things to keep in mind about when and how to change your battery for your security system. The first sign that you have a low battery on your alarm system is when it starts to beep, chirp or show a low battery icon on the display. Generally it won't be consistent, but over time it will be more consistent.