I like to hear that many use the a123 with no regulators. My point compared to a 5 cell nimh or nicd is that they have not the same ability to keep their voltage when things start drawing amps. It is not the voltage that is "dangerous" but the high amp and thereby temperature in the receiver especially. The A123 is not directly comparable to a 5 cell nimh or nicd altough you can see the same voltage when they are fresh.