Newer batteries have a coating around them that prohibits fires, I've had lipo batteries for almost 3 years now, and I leave the batteries connected all the time. The only time they aren't connected is when I need to charge them.
So the point where you say they are prone to fire only counts for dirt-cheap unstable batteries that use old technology. I use Azimuth and GePower 7.4V batteries that cost $20 each. Never had any issues with them and after 3 years all 5 batteries I have still function flawlessly.
So the point where you say they are prone to fire only counts for dirt-cheap unstable batteries that use old technology. I use Azimuth and GePower 7.4V batteries that cost $20 each. Never had any issues with them and after 3 years all 5 batteries I have still function flawlessly.