Bike cutting out

[Robw1uk]

Hi All

I have a ni-mh 24v battery pack , after the charge i go on my bike and as soon as i hit a slight hill it flashes empty , and sometimes cuts off , then i have to turn the key on and off to get it kicking back in , i originally thought it was the pack so i purchased new batteries and made an identical pack left it charging for 12 hour and tried it, the exact same problem is happening , could someone point me in the right direction to the problem ,, not sure if the charger is knackered or the control unit faulty..

thanks in advance

Rob

 

[CheKmx]

http://www.pedelecs.co.uk/forum/electric-bicycles/2003-recumbent-electric-trike-2.html?highlight=Kmx+cobra

I had a similar problem. In my case it turned out the cutout on the battery was too low and a new battery fixed the issue.

 

[flecc]

Yes, it's definitely the low voltage cutout operating, maybe a problem with one of the new cells you fitted. It's important that they all match, just one low one and you'll get this problem.
.

 

[Robw1uk]

hi thanks for replying yeh checked all cells and they are the same ,the bike just lacks power even when i stand still and hold the throttle and hold the bike back a slight touch , thers just no kick in it anymore

 

[onmebike]

I assume your using the same make cells as the original battery was supplied with. Different makes vary greatly in their ability to provide power.

Is it possible your original battery is nearing the end of its useful life and the new cells[if not the same] aren't up to the job? The result would be similar.

If you have access to 2 x sla batteries wired in series to test bike, it may confirm battery is not at fault and you can look elssewhere for the problem.

 

[Robw1uk]

i will try to get hold of 2 x sla batteries , just another question then would sla batteries run this bike ? i allways just use the assist never throttle , ill keep you posted ..

 

[onmebike]

i will try to get hold of 2 x sla batteries , just another question then would sla batteries run this bike ? i allways just use the assist never throttle , ill keep you posted ..

I see no reason why not. Although deep cycle ones would be best, any should do for the sake of this test, providing their of suitable Amp rating.

 

[Robw1uk]

Ok thanks , what amp rating would you recommend ? ... in the mean time ill see is i can get hold of a couple just to test it ..

 

[Robw1uk]

Hi

Could you just tell if 2 of these would be ok to actually run it ?

Battery Masters :: Ultramax NP9-12, 12V 9Ah Lead-Acid Rechargeable Battery

 

[Robw1uk]

Hiya Just wondering if i can get any feed back on this new question ? , seem i cannot make any new posts anywhere either

 

[onmebike]

Hi

Could you just tell if 2 of these would be ok to actually run it ?

Battery Masters :: Ultramax NP9-12, 12V 9Ah Lead-Acid Rechargeable Battery

For test purposes they should be fine but not being deep discharge type's I'm not sure how they'll perform on an ebike. For the price I'd certainly take the risk. Also look at the 12ah mobility battery on the same site that should be more suitable but twice the price and much heavier.

 

[theskip1]

yes you could run it on two deep cycle sla batteries. get 10amp or higher (the higher the amps the more the range ) any sla batteries will do to test it inc. car batteries.

 

[Robw1uk]

Hi

Back again i got hold of 2 12v 12ah sla batteries and made sure they were fully charged attached them and the empty light still seems come on just gently holding the bike with throttle on , and it also did cut out again , Maybe the brushless motor controller ?

thanks