Had a gen failure followed by a battery failure in a jetbox (it was cart started). The press-to-test button didn't light up anything on the enunciator panel during the flight, the radios went dead, however the baro instruments, engine indicators and tachos were still working. Don't know if the FCU has electrics but both fuel pumps read zero pressure and a slight lateral twitch was observed confirmed by the Tq gauge flickering 1%. A smoothly handled steep approach back to base was no drama.
Young people tend to get too focussed on the numbers with these relatively simple machines (I know I did), but at the early learning stages they should step back a bit and it will be easier to keep the numbers where they should be, as experience builds they can then do things in a jetbox like keeping the RRPM right at the very bottom of the green arc in a stretched auto as the audible horn screams. Should the electrics go TU and the donk is still running then the situation is still quite salvageable - don't panic as they say.