many more years
You should be getting many more years out of your system. The motions might need to be replaced however they too should last. It will depend on what type you have, Ultasonic (older style) or inferred. You can try to clean them. vacuum the ultrasonic and wipe clean the lens of the inferred.
Newer system have much better options like when the batteries die they do not send an alarm but a trouble letting you the problem. Also the newer panels connect to the internet and you can use your Iphone/Ipad for interface and alarm reporting thus eliminating the central station and their fees.
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