I've done a bit of searching and didn't find an answer. I know the CDM mobile doesn't have Low Battery Alert option accessable in the software like the HT portable does, I was wondering if anybody has done any mods to the software package to possibly enable it. I have an application where I have put a CDM in a Pelican case for use by our Fire Brigade in the tunnels under NYC. It would be nice if the radio chirped when the battery was getting low. I have a few other ideas, but this would solve the problem with minimal effort.