It sounds like your talking about lipo batteries, while lipo's do demand respect, if proper charging and having the ESC set up to not allow them to discharge too far is used they are quite safe. a good storage practice is suggested as well. Like Pat said it's realy not that complicated just very different from glow.
In most cases now you can buy motor ESC combo's and they will rate them for amp draw so choosing the proper lipo to work is made easy. It just requires a little more research or asking someone to be sure you have a compatible set up.
I'm sure if you tell us what you have and what your trying to do, you will get the answers you need to get you back in the air
Oh and Welcome back