Hi all I am new to this forum and I was hoping that I could get a little bit of help

I have tried searching and searching for an answer to my problem but alas I can not find it anywhere
I just recently bought two second hand bighit bikes one for parts and one that actually works (supposedly)
here is the problem- when I am riding everything is fine the pedal assist kicks in nicely just enough to help me get up to speed, but when I get past about 2 kms sometimes more in distance all power just shuts down and I am unable to turn the bike on..... at first I though it was a loose wire or something (witch it could still be) but i checked all over and couldn't see one. so I was playing around in the battery area where the controller is and I though oh maybe the controller is stuffed so I opened it up and every thing looked fine... then I plugged it in with its case of and a red blinking light came on on the controller I though great that's not the problem, so I started fiddling with some wires when bam the controller started smoking so I disconnected it and though well that one is stuffed that must have been the problem. I got the controller from the parts bike and put that on the good one and rode almost 5 kms when it cut out. I took it home checked the fuse and wiring and nothing seemed wrong I unplugged the fuse and put it back in and it was all working again grrr I am at my wits end I need help :/

thanks in advance this looks like a really great forum If you have any questions please ask as I really want to solve this xD

Jwerta

Ok lets look at what gives the motor power. You took the controller out of the problem by uses a good one.

The 36V 10Ah Lithium battery has a BMS. If the BMS is overheating then it will cut power to the controller. Also if the motor is pulling to many amps then the BMS will cut power to the controller. By pulling the fuse and resetting the system it resets the BMS as well. Thats why I think it's the BMS.

As far as the battery goes. You may have a bad cell in the pack. This will show up by a lower voltage at full charge with a volt metter. Li-Po cells come 3.6v per cell. So for a 36v pack you should have 10 cells at 3.6v per cell. Now if you have a bad cell it will show only 32.4v. Now the volatge cut off for a 36v battery is about 29v. Thats 80% of the full charge of the pack. So if you started out with a 32v volt charge it will cut out a lot faster then it is rated for. Because the BMS is doing it's job.

in short it's the BMS or the battery. Hope this helps

Thanks

Yea I have found out that the battery is just really old and is not holding much charge... also there is 7 cells and the battery reads it is 24.9v :/ they are also bulging a lot which I am guessing means they are stuffed!

can any one recommend a good battery and maybe also a controller to go with the battery?

Thanks in advance.

Ping has a good reputation. They also a very service oriented. Mr Ping himself e-mails you if you have any questions about there products. Don't bother getting a SLA battery. Need to replace after 1 year.