Andis FlitzerThe A sideCase study100 km/hTesting batteriesCooling gridContacted cellsfinished battery packsThe B side
LocationLucerne, Lucerne Switzerland map
Web/EmailWebPage email image
Vehicle1981 Yamaha RS 125 DX
MotorGolden Motors HPM-10KW fan cooled Brushless DC
. Initially I struggled to get a certificate for the continuous power measurements for the road registration procedure. But the Swiss registration officer assured me, that they won't request this, as long as the declaration on the motor looks trustworthy.
DrivetrainChain Drive
ControllerKelly KLS7250D, 24V-72V, 400A
Batteries72.00 Volt, Lithium-Polymer
New technology Graphene Lithium Ion Polymer cells from Shenzhen WESTART Technology Co. Ltd. 40 cells, 3.6V, 20Ah, continuous discharge 10C, totally 2.88kWh. Water cooling built in but not used.
I use them in 2p20s configuration, separated in 5 boxes, water tight.
System Voltage72 Volts
Charger 2x 84V 3.4A
I use two budget charger: XieTong C300 from china. They fit nicely under the old tank.
DC/DC Converter Delta B70SR12424A
12.4V, 300W, water resistant IP67, EMC compatible for vehicles.
Top Speed62 MPH (100 KPH), I'll try a different sprocket to get about 68 MPH (110 KPH)
Acceleration0 - 80 KPH in 6.7 sec.
0 - 100 KPH in 12.1 sec.
I haven't seen a quicker 125 ICE :-)
Range30 Miles (48 Kilometers)
At least 30 Miles (50 Kilometers). At the first range test it did 50km with 60% of the capacity.
Watt Hours/Mile39 Wh/Mile
On a curvy race track, top speed 40mph (60km/h)
EV Miles
Start:20,525 Miles (33,024 Kilometers)
Current:20,565 Miles (33,089 Kilometers)
Total:40 Miles (64 Kilometers)
    As of 11/28/2020
Seating Capacity2 adults
Curb Weight0
280 lbs (127 kg), estimated, including batteries
Tires2.75x18 and 3.0x18
Conversion TimeI started the Project in November 2015. Soon finished...
Conversion Cost> 8000$, I stopped counting...
The project is still going on. It's given me a lot of fun and a lot to learn.
Figuring out how to pack the batteries into that little space took a lot of time. Right now I'm completing the onboard charger and getting the papers ready for the registration. I need to write a complete Certificate of Compliance.
Watch my movies on
And this one:

code by jerry