My house was built in 2004 and came with fire alarms pre-installed and hardwired. The alarms also use a 9V battery backup, so we have to replace the batteries regularly (not an easy task with 9 ft ceilings, neither of us is exceptionally tall).
It's time to replace the alarms, and we were looking at the 10 year sealed lithium battery units (so we don't have to replace the batteries, we can test the alarms with a broom handle easily enough), but they don't seem to come in a hardwire variant.
Should we do something with the wires that are coming out of the ceiling? Would it be safe to not have them hooked up to anything? The circuit that feeds the alarms also powers the master bedroom (this house was built during the construction boom and it's terrible).
Would we loose any functionality by not using the hardwires?