Hi!
Yeah, definitely! I use 1,2 V rechargables in my boomboxes
I am not technical expert but I think it is what happens anyway..when the boombox gains power from normal Ds, their voltage goes down...that is how the battery indicators work.
It would be plausible because my Crown 935 only shows 4 of 5 bars when I run it on fully charged 1,2 V rechargables
Welcome aboard by the way! Ciao!