Gundog wrote:
For a replacement does it have to be an RV type they are much more expensive. I like the idea of it having its own battery and not rely on the house batteries.
In my opinion, it does not need to be an RV-specific unit. I replaced mine with a dual-function household battery-operated smoke/CO detector (same with the original smoke detector at the other end of the motorhome). The household ones that I got at least do not work properly in very cold conditions, so I have to remove the batteries during the winter when the RV is in storage lest they go off continually. I don't think that's a significant safety hazard in as much as I would not be using or sleeping in the RV when it's below zero inside it.