BruceInLagunaWoods I run my OS4 24/7 plugged into USB to monitory the reflector I manage. The battery charger goes into trickle charge. Had mine for over a year and works fine. When I first got it, the battery never lasted more than 4.5 hours anyways, and when I travel, and I run on batteries, it so far, remains at about 4.5 hours.
I would not worry too much about it. If you need it on 24/7, then use it that way. I'm looking at mine right now, and the charging light is off, plugged into a charger and it comes on when it transmits to keep the battery at capacity. Eventually, the battery will fail, but that will be a few years down the road.
Perry - WB7NIL