Recent content by Toronto_ebiker

Only one way to find out... test them

Is that a Signallab BMS?

Thanks again... This might just be a balance issue. that cell group tested at 3.4V when the battery arrived.

At what voltage should I disconnect the group at? The other groups are sitting at 3.1-3.2V? Sorry I'm a little new to battery packs so I appreciate your help and speedy responses!

Is there a solution that does not require spend extra $$$. I have a precision 2 amp benchtop power supply 0-30v, could I use this to charge up the low group?

Update: I discharged the battery again with the same result as last time. I tested each BMS lead from the battery and here was the result: 49.8 46.6 43.4 40.3 37.1 34.4 31.2 28.0 24.9 21.7 19.0 <<<<<<<<<< 2.7 15.8 12.7 9.5 6.3 3.1 Looks like one of the groups of cells isn't working...

I ordered some 18650s single cells from ebay is anyone interested in testing them out? I don't have the proper equipment to test single cells.

Don, This is my thread and your opinions (right or wrong) are welcome. Here is a data sheet on the 18650 and by the looks of the chart the battery have 80% capacity until they are cycled more times. I will keep on cycling the battery every day and post the results...

I'm not complaining since it was VERY inexpensive and my bike weighs 60lbs less since tossing the SLAs and it also goes way faster :D . mr. lau's a douche

I have sent an email to the seller with my test results and asked for a working BMS. The seller does carry them and the ones pictures look much nicer then my solder smothered PCB that came with my battery.

So it appears that the BMS is cutting power to the battery at 48.4V which doesn't seem right. Here is the graph of the data I collected:

Thanks Don:)

What is a safe voltage to take the battery down to without discharging the full battery?

I'm testing battery ah right now with my kettle which is drawing 5.6amp.. I will be testing voltage every 10 minutes... see you in 3 hours 8)

I do understand what you meant. I do agree that rejects can end up in these cells without Valence knowing or maybe they are counterfeit batteries who knows? We can only speculate without contacting valence. I did however take the battery for its first official test drive and I was happy with the...