BIKE LOSES POWER

[mellingford]

Hi All
Anyone help with problem on my Izip Skyline 24v pas electric bike.After a certain milage bike loses all power,on switching key off then on,power returns but as soon as i start to pedal,switches off again,on leaving overnight normal power returns,but when i have cycled a certain milage, problem returns,don,t have milage indicator but seems to lose power about same distance every time.OK seems something is overheating BATTERY,MOTOR,CONTROLLER? Seems to point to controller,and if controller may need some help aquiring new one.
Thanks

 

[trex]

your battery has a weak cell.

 

[Deleted member 4366]

Almost certainly your battery. one or more cells probably hitting LVC. How old is it? Do yo have the wherewithal to test it if we walk you through?

 

[mellingford]

Thanks thats a big help,to isolate the problem is halve the battle,i was surprised to find out it was the battery as when the problem occurs i checked the battery with the led indicator and it allways reads 3 bars green, indicating full,is it the battery managment system that is reading a problem with the battery.I am ok with electrics and it would be a great help if you can talk me through the testing of the battery.I have the brushless tester for the controller but not sure if that would indicate a battery problem.
Thanks
PS BATTERY IS 3 YEARS OLD

 

[Deleted member 4366]

If you want to find the exact cause, you need to open the battery up and measure the individual cell voltages with a voltmeter. You need to show some photos of the battery and what's inside if you want more specific help.

Is it this type?
http://djmdirect.donatien.co.uk/products/izip-skyline-spare-battery-pack-24v-10ah-lifepo4

 

[mellingford]

If you want to find the exact cause, you need to open the battery up and measure the individual cell voltages with a voltmeter. You need to show some photos of the battery and what's inside if you want more specific help.

Is it this type?
http://djmdirect.donatien.co.uk/products/izip-skyline-spare-battery-pack-24v-10ah-lifepo4

Hi d8veh
You have been very helpful in the past regarding my problems with the Ezip and the battery you listed is the one,regarding opening up to see what the problem is,been there done it and am wearing the teeshirt. Having purchased a Fast4ward PEAK on the cycle to work scheme about 2 years ago had the same problem after a year using the bike, battery started giving problems, on this occasion the battery was definitely the cause,after riding for a certain distance,power went, on checking battery condition only one green led was showing.The battery was guaranteed for 2 years,so I suppose I was eligible for a replacement but could not resist having a look.Well having opened up lo and behold for starters the battery compartment was soaking, the cause,not weatherproof enough,or condensation with heat of battery,compartment who knows.Battery case consisted of BMS and 3 modules of 12v.The modules consisted of 4v aa type batteries on checking the modules one was reading low,ok lets check the individual batteries out,first problem batteries are spot welded together, best of luck separating them,got stuck in with my trusty snips,after nearly decimating the module, managed to separate the individual batteries, out of 18 batteries,still cant work out how they have configured them to give out 12v, suspect so many for power and rest powering BMS but who knows,anyway out of 18 batteries 4 shorted ie dead,so out of a whole pack of batteries, 4 shorted batteries render a £200 battery pack useless,fair enough never putt a load on the other modules but they looked ok.So going by my experience if you open up the battery there is little you can do.This post in no way detracts from the expertise of the fine members who give such invaluable advice to members
Thanks