traceour

Well, hooked up 36V to the bike, battery bar flashing, no other life. Tempting to put 36V to the 3rd pin, grey wire. But assuming it not that easy!?

Send the pictures to my local Helkama dealer, he thought it was 36V. Now i will try to hook up a battery to test. If not working I have to investigate what the 3rd pin does

Not sure, thus I like to test it first on the bench before I buy a battery. Now I'm unsure what voltage it is

Thanks guys for so much info, took some photos today, the display has an 36V label underneath!? The drive unit has a label of: Num082 WKS-8 Thin wire in the second pin

Okey, thanks for the link, will give it a read

Thanks for that, will give it a go then

Hm, sure? Only 3pins on my bike, but if I bypass that, my question is how the bike will behave on 24V?

Hey! Just got an Helkama Cargo Bike, not sure the model.. Asuming its 26V. Panasonic motor. The OEM battery are a fortune and I wonder how the bike will run on 24V? Could it work? If so, I build my own battery and 3D print a new case