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Some home security systems come with a back-up battery that can last for up to 18 hours. These batteries are meant to ensure the security of your home even during a power outage.
Before leaving for vacation, check the status of your back-up battery to make sure that it is fully charged. This way even if there is a power outage in the neighborhood while you are away the alarm should still maintain your security at home.
Once the electricity comes back in the house the back-up battery should begin to recharge itself. The 18 hour lifespan of the battery should keep your home protected during any service interruptions, but just in case the outage is longer than that let a trusted neighbor know.
If the power is off for more than 18 hours they can let you know and you can walk them through re-activating your home security alarm properly once electricity is restored. If your back-up expires before 18 hours contact the security company to let them know about the problem. They may be able to fix the issue or replace the battery with a new one for you.