the alarm system's owner's manual to identify your battery type and how and when the main battery should be replaced.
Look at the front panel of your
alarm system. Many alarm systems have a "low battery" indicator
light on the front panel, indicating when your battery is low. In some
alarm systems, the "low battery" light will be on for several weeks
before the battery completely dies. If the light shows "low battery,"
it is time to replace it.
Notify your alarm system company when you plan to test the battery before you replace it. Inform the
company that you are going to disarm the system so you can safely test the
Remove the battery in per the owner's
manual instructions for disabling the power supply. If you are not
confident you can do this, ask the alarm company to send a
technician. The alarm service company may be able to test the battery life for you.
the battery to an repair shop that has a battery tester if
your alarm company can't or won't test the battery for you. Have the
repair shop test to determine the life left in your battery. Replace
the battery as necessary.