L-faster 24V36V 350W Electric Brush Motor Speed Controller for e-Bike Conversion kit

Label may say 36V/350W, but the unit they shipped me is actually a 24v model - I finally looked in the end and can clearly see that there are only 3 transistors, not 4. When researching the YK31C boards, I found that the only one to have 3 transistors is the 24v model. I was assuming at first that maybe I had to do a shunt bypass or something to tweak the resistance and thus output amperage but if it's not even a 36v unit to begin with? No good.I discovered this after a lot of troubleshooting, as it would seem to work at lower throttle then suddenly start to "shudder" and slow down as I increased it. Motor tested out fine, new throttle and voltage meter worked fine, new battery monitor seemed fine.... only it was slowing down. So I tried to charge it up, thinking "well, I'm at about 85-80%, let me top these off here" and there's where I ran into problem #2 - it's a 24v system so it won't pass the charge current through - it "protects" the batteries from the 36v charger.That being said, if you NEED a 24v controller this might be fine. Just don't buy it as I did to assist in upgrading a 24v razor scooter to 36v.

burned the one that came in the kit.needed a replacement.pay attention to the cables and diagrams.works just fine.

No instructions, and different connections than my scooter... otherwise, a good product.

I'm happy with it. Most connectors were labeled in English. Used to convert Razr Moped to 36V. Hid the 3rd battery in the seat.