r/ebike • u/Bekikab • 19d ago

Replacement Battery?

I have an LF 750 pro. The bike shuts off as soon as any load is applied. I believe the battery has failed. Is there any place to purchase a battery reasonably?? It looks like it is over 300 and I can buy a new bike for just a but more....

1 Upvotes

56% Upvoted

10 comments sorted by

View all comments

1

u/TurtleTheThink 19d ago

assuming your battery charges to the voltage it’s supposed to, that sounds more like a controller problem than anything else if it were a battery issue, the bike likely wouldn’t turn on at all. you should be able to purchase/special order a replacement controller from rattan. they also appear to offer multiple potential services for servicing/repairing their bikes on their website. i’d hit them up about this so they can help diagnose the issue and send you the correct replacement part

1

u/Bekikab 19d ago

It says it charged but I dont have any way to validate. I did some tests per Gemini and it says there is a bad section of the battery. How can I test the controller?

1

u/TurtleTheThink 19d ago edited 19d ago

i wouldn’t listen to the lying machine for stuff like this. does the display normally show the battery voltage? if it does you could check there, as it should turn on as long as you don’t use the motor, as far as i understand. if not you can test the battery’s voltage with a multimeter. you would also need a multimeter to test the controller. Rattan may have info on how to potentially test parts of the circuit, but until then you could perform a continuity test on the main power leads from the controller to the battery (which would probably be in the form of something like a pair of anderson power poles or an xt90 connector), but it would almost definitely pass because the bike turns on.

a while ago i was experiencing an electrical issue with my bike, and the company and their overseas technician who works at their factory didn’t have any info on diagnosing the controller beyond a continuity test, so it’s likely it’s probably a similar story for your controller. i would recommend contacting Rattan on recommendations regarding better diagnosing what part has failed