@Landsteiner posted:"If I were to purchase the new command base, but still wanted to use a hand held remote, I would need to keep the old base for recharging the remote, yes?"
YES, recharging can only be done with the Legacy #990 or #993 expansion pack. Better the use the 993. I would bet having the CAB3 and the 990 both powered at the same time would fight each other communicating to the remote.