Mark, is your D&H RS11 the one from around 2001-2003?
Do I assume correctly when you say no Legacy, that implies no Command at all (TMCC)?
Make sure your RUN/PGM Switch is in RUN
Make sure the SND/NO SND Switch is in SND
From what you have written, it appears you do have sounds, but they don't continue as they should when using a battery.
One thing you may check when you have the shell off, as you would to change the battery, is make sure the connector's leads have not become detached from the circuit board.