Some more details:
Model: RSZ
Color: Lamborghini-green
Bought in summer 2014, got a totally new battery in 2015 (within guarantee)
Engine upgrade: 60v2000w (speed 80km/h)
Battery: LI-ON 60, 30AH (50 km range)
Suspension upgrade: Gas spring shock absorbers
Brake upgrade
E alarm
Lock (U Lock)
Buying price 11,000 RMB
Selling price: 7,000 RMB (-40%)