So, i asked Aaton France about 12v and 16v...
This is what they say :
2 kinds of electronic are on the Aaton.
The oldest one is in biphase. T
his kind of electronic have only 24, 25, 29 and 30fps quartz.
To rank over 40fps you need a 16v batterie.
The new one are in 12v triphase, they don't need any different batterie to rank to 75fps. Also, the speed can be preset with 3 numbers after the coma (0,001fps).
The 12v new model are quartz for all the speed.
I hope, it's enough clear.
Otherwise, let me know.
Have a nice day