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Normally you need to replace the battery periodically if your system has one. Some old designs of installed systems (not self installed wireless types) are hard wired to a power source and don't need batteries but nowadays most systems have built-in stand by batteries. On security systems that have a stand by battery, that kicks in on power failures, the battery is charged by the motherboard of the system. There is an on board charger where the battery connects to the board. After a power failure, when the power returns, a sensing circuit detects that the battery is low. It automatically starts charging the battery back up to its fully charged state. These batteries usually last about 10 years before they need replacing.

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Consulting your user guide is a good starting place for determining if you need to change your battery emergency light in your home security system. If the battery is not the cause there may be other trouble shooting tips located in the manual.


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I would highly recommend that you get your alarm security system fixed or changed. Having your alarm go off late is not good for the security system. Go to homesecuritystore.com and they have a wide variety of home alarm security systems.


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ADT home security systems are installed with a battery backup unit. You may just need to contract your authorized dealer to test and make sure that it is working properly. If your system isnt from ADT, you may be able to utilize the GE 300384001 Power Supply.


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