Interesting, I've been flying real A123 cells from Wrongway RC and Tail Dragger RC for years. Hundreds of flights, many times what any average modeler would get per year.
I also run my ignition from the flight pack on anything up to and including 60cc with no ill effects using a single 2500mah A123 and a Tech Aero IBEC.
Anything larger gets a power safe rx and a tech aero IBEC