Hi Petr
NiMH cells would probably work, at first !? Their voltage is lower than AA alkalines, drops off even more with use, and are not recomended for that reason. Also the "shelf-life" (time to self discharge) of alkalines is measured in years, much longer than that for NiMH cells
I agree with Mick, use alkaline AA cells.? They worked well for several years in my Z-817.
All the best for 2023
Gordon VE3JSJ
