How long will a battery backup power the L5000?

The Honeywell L5000 LYNX Touch wireless security system has a LYNXRCHKIT-SC battery backup included that will provide power to the system for (4) hours when no AC power is present. You can also upgrade to the LYNXRCHK-HC high capacity battery backup to get (24) hours of power during a power outage. If one of the L5000 LYNX Touch wireless security systems is using the AlarmNet GSVMLP5 cellular alarm communicator, it will require an upgrade to the LYNXRCHKIT-SHA super high capacity battery to get (24) hours of backup power for your Honeywell wireless security system.