Reply from MVVS on the ignition voltage on the S unit.

Hello,

S ignition till 10V there is not problem. 11V is Top line.

Best regards

Lukas Chymek
Technical Support / Technická podpora

MVVS, spol. s r. o.
tr. Kpt. Jarose 35
60200 Brno
Czech republic

Bottom line is the S unit can take up too 11volts so a 3S A123 battery should be OK, fresh off the charger would be 10.8 volts.

The Pro unit can take up too 16volts so a 4S A123 battery should also be OK, fresh off the charger would be 14.4 volts.

Hope this helps all.

Mike