How long will a battery backup last in the L3000?

The Honeywell L3000 LYNX Plus wireless security system has an included LYNXRCHKITSC battery backup that will provide power to the system for (4) hours when no AC power is present. You can also upgrade to the LYNXRCHKITHC high capacity battery backup to get (24) hours of power during a power outage. If your L3000 LYNX Plus wireless security system is using the AlarmNet GSMVLP cellular alarm monitoring communicator, you will need to upgrade to the LYNXRCHKITSH super high capacity battery to get (24) hours of backup power for your Honeywell security system.