Batteries:
4 X Long 12 volt 50Ah + 1 Alco X 45 Ah (5 in total for 60volts)
Charger:
EVT 48 volt + meanwell 12 volt
Conversion time and cost:
2 hours to add extra battery from stock
Curb weight:
140kgs now with extra battery installed
Method for 12v system:
48V/12V DC to DC converter