Many home security systems will go offline but will work off a  backup battery  when the power is down. Some alarm systems operate using a 12 volt 4.8 AH  Rechargeable Sealed Lead-Acid Battery. These run on a  trickle charging  system. Trickle charging allows a battery to self-charge at a low rate in order to remain fully charged. Lead-acid batteries last longer than a typical lithium-ion battery, which needs an adapter in order to recharge regularly.

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