I have been running a 24v 32AH battery n XYD 500w motor on my e300 for the last year. I can get a 20mile or 32km return trip with batteries charge to 4.2 and end of trip 3.82v per cell. Now I have some spare space under the deck to fit a home made 18650 12v pack I have scrounge from dead Dell laptop batteries at work.
I read on an endless-sphere FB page a dude had a switch connecting a 12v straight to the motor so he could have extra acceleration when needed.
Issues and best practice?
There are times when it would be nice to get up a Hill or pass someone at a push of a buttom!