Lowest operating voltage for MMM and MMP

[E-Revonut]

I'm not a proffesional but I would make an educated guess and say that 4.8V is the minimum. I know it's not the same but my Mamba 25 will run just fine on a 4 cell nimh pack but after a couple minutes if I try asking to much of it, full throttle starts, it cuts out for a moment as the large current load drops the voltage.