I am building an electric narrow gauge train unit using 1.8kW brushless DC motors to run on a 15" gauge line to access a remote cabin in Scotland. It seems more fun than a roadway.
My initial set up uses four 12V 12AH AGM lead acid mobility scooter batteries in series - mass isn't a big problem for a train!
Could the VESC 6 MkV unit use regenerative braking into lead acid batteries (with careful setting of the maximum current) or does it only work for lithium ion? I want to check first before trying.