Search results

Date Relevance Most replies

  1. Toronto_ebiker

    Valence 18650 cells

    Only one way to find out... test them
  2. Toronto_ebiker

    Dead Ping Battery 48V 20AH

    Is that a Signallab BMS?
  3. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

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

    Mr. Lau 48V 15ah Lifepo4

    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!
  5. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    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?
  6. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    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...
  7. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    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.
  8. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    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...
  9. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    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
  10. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    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.
  11. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    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:
  12. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    Thanks Don:)
  13. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

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

    Mr. Lau 48V 15ah Lifepo4

    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)
  15. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    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...
  16. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    I agree with you, but for $280 I had to try it out. even if the few of the cells die (murdered) then I will take the pack apart and make smaller packs for only $1.60 a cell which is what I paid $280/176cells. I wish I had some decent equipment to test the cell with.....
  17. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    Can you confirm that Valence sells their rejected batteries in bulk to manufacturers of duck tape packs or are you speculating?
  18. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    removed
  19. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    Those single Thunder Sky cells are cheap! $37 for 3.2v 20ah? I might have to pick a few of those up at that price. http://elitepowersolutions.com/products/product_info.php?cPath=16&products_id=74
  20. Toronto_ebiker

    Fuses

    I'm pretty sure you can use large fuses for residential/commercial panels or even breakers. http://www.interfacebus.com/fuse-operation-ac-dc-voltages.html
  21. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    By the looks of the construction of my battery maybe he has cleaned up his act. There is not 40 layers of duct tape like other batteries people have taken apart, but rather a few layers and a very hard shell that holds the batteries tightly in a group. I did not want to investigate beyond this...
  22. Toronto_ebiker

    Mr. Lau 48V 15ah Lifepo4

    Despite all the negative comments about Lau Chan batteries mostly with regards to faulty BMS and chargers that were broken in shipping, I ordered a battery from lifepo4.HK. These batteries are currently being sold under seller name lukeya59 as well as others. I did not realize at first that this...
  23. Toronto_ebiker

    Daymak smart bike review Toronto

    UPDATE: I have rode my scooter almost 100km and love it. There have been no other issues with the bike since my first post. I crossing my figers that the city of Toronto legalizes these type of vehicles once the pilot ends in October 2009. They are a fast and efficient method of traveling...
  24. Toronto_ebiker

    Daymak smart bike review Toronto

    That's no good for your friend. The bike is pretty useless without brakes. My bike makes rattle noises too when I go over bumps, but I'm not sure if there is anything I can do to stop them. I will give daymak some credit towards the wiring harness and electronics which seem to be top notch. I...
  25. Toronto_ebiker

    Daymak smart bike review Toronto

    Daymak 2009 smart electric e-bike/scooter This review of the daymak electric bikes should help you decide whether or not the daymak scooter are right for you. I had been looking at e-bikes for quite some time trying to decide if I would use it enough to justify spending $1400 on an electric...
Back
Top