So! I read most the post and was thinking on adding 2s to the M365 Pro to push it to 48V but using the original charger and the original charging port to charge it.
Basically i'd add another 2s8p batteries in series to the original 10s4p battery, using tons of diodes to keep the current flowing in a single direction to avoid short circuiting the charger and adding step-down voltage to charge the 2s battery.
I think I can ignore the voltage of the external pack since it's rating would be higher than the original battery, the original would probably deplete it's charge sooner than the external pack, so I could use the reported voltage of the original BMS report as the default mean to monitor the whole scooter charge.
ex: the internal battery would go down to 30v long before the external one goes down to 6v; the external pack would probably juice up to 8v much sooner than the 40v of the original pack
And since the focus is to improve speed, I wouldn't mind having extra juice unused on the external pack.
Do you guys think this would work?