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  1. P

    something not charging

    Ok i have another meter that say's 3.68v while charging. Anyway it does not seem to be balancing,it only turns off and on and the other cells do not catch up. How do i manually discharge dogman dan wrote: Contact those two wires to the terminals of the cell you need to discharge, if you have...
  2. P

    something not charging

    I cannot get to the individual cells,how do i discharge through the bms,do i use the 2 sense wires that i detect the high voltage. Thankyou Paul
  3. P

    something not charging

    Does this bms balance, http://www.aliexpress.com/snapshot/6290240442.html?orderId=64171138909262. I have 12s 5p. lifepo4 It seems to turn off when 1 cell gets to 3.65, the other cells are from 3.4 to 3.55. When the top cell goes down to 3.5, the others are 3.25 to 3.4, the bms chargers again...
  4. P

    something not charging

    It is already at 43.1 by my multimeter
  5. P

    something not charging

    Not at the moment
  6. P

    something not charging

    I have a 12s 5p lifepo4 pack. I charge through this bms http://www.aliexpress.com/snapshot/6290240442.html?orderId=64171138909262 The charger is http://www.aliexpress.com/snapshot/6486119718.html?orderId=65738565059262 it has 43.1 volts at the pin by my multimeter. When the batteries get to 3.3...
  7. P

    Li-ion battery charger on lifepo4 batteries

    My mistake it is 12s What output do i need.
  8. P

    Li-ion battery charger on lifepo4 batteries

    Would there be any problems using a li-ion charger on a 36 volt 16s 15a lifepo4 pack with bms. Charger is 42 volt, 1.8a. Thankyou Paul
  9. P

    48 volt lifepo4 pack at 35 volts

    e-beach like i said previously it only went as far as 0.8v then dropped back to 0.4v while still on the charger.
  10. P

    48 volt lifepo4 pack at 35 volts

    e-beach,i charged the cell individually like your earlier post. I thought the bms lvc would cut out when any cell dropped below 2.0v or what ever it is.
  11. P

    48 volt lifepo4 pack at 35 volts

    Ok,i do not have the battery connected at the moment to the bms,the one cell does not charge. Also why does the motor start through the bms on 15s.
  12. P

    48 volt lifepo4 pack at 35 volts

    I do not know how to test the shunt transitor,but i was just thinking,the motor still runs on 15s,should it not shut down the bms because 1s is dead.I have pulled the pack apart and tried to charge the dead cell,it only goes up to 0.8v then with the charger still on drops back to 0.4v.
  13. P

    48 volt lifepo4 pack at 35 volts

    I have a dead cell. vpower tell me they are 26650 3.2v 3000mah batteries. I need 7,vpower want $10usd each plus delivery,i am considering my options
  14. P

    48 volt lifepo4 pack at 35 volts

    Please be patient,i do not even know what a shunt transistor looks like,can you see it on this board
  15. P

    48 volt lifepo4 pack at 35 volts

    because 7 have no voltage
  16. P

    48 volt lifepo4 pack at 35 volts

    I have pulled the pack apart,looks easy to split in two,that is what i wanted to do anyway Nothing looks unusual to me. It is in 16 rows of 7. batteries are unmarked,so i assume they are 3.2v 3000ma each=48volt 20ah. Now to find some.
  17. P

    48 volt lifepo4 pack at 35 volts

    I will pull the pack apart and have a look
  18. P

    48 volt lifepo4 pack at 35 volts

    What should they be charged at This is new to me,i do not know what you are talking about with shunt resistor. When the charger turns off the bad cell no12 is only .8 it drops back to maybe .3 then charger turns back on goes back to .8 How do i charge individual cells.no12 already has 36 odd...
  19. P

    48 volt lifepo4 pack at 35 volts

    I have charged the battery once.let the charger cycle on and off for 2 hours. !5 cells are around the 3.46 mark,one is 0.8. Have left the battery for 18 hours. 15 cells are on around 3.26,one is completely dead. I thought the good cells would be less,because they would be trying to top up the...
  20. P

    48 volt lifepo4 pack at 35 volts

    I bypassed the bms,voltage went up to 48v in a couple of minutes,disconnected and hooked up to bms,started charging again. Has been on the charger for 1 1/2 hours,is up to 52v,will let you know what happens.
  21. P

    48 volt lifepo4 pack at 35 volts

    What do you call the c- terminal
  22. P

    48 volt lifepo4 pack at 35 volts

    It looks like that is the only way to charge individual cells,pull the pack apart
  23. P

    48 volt lifepo4 pack at 35 volts

    They are 9b 10b 11b 12b 13b 14b 15b +b that would be 16,the other 8 are under
  24. P

    48 volt lifepo4 pack at 35 volts

    1-2.9 2-2.7 3-3.0 4-0.8 5-3.1 6-2.6 7-3.1 8-3.0 9-0.1 10-2.2 11-2.9 12-0.1 13-2.2 14-3.0 15-0.1 b+-3.1 9-12-15 are flat and 4 is not much better. The battery charger is charging at 58v but very little is coming out,it has gone from 35v to 38v in 3 hours Battery is 12 months old has had 14 charges
  25. P

    48 volt lifepo4 pack at 35 volts

    I used the positive on the left,looks like a hole then negative on the 7 ones to the right. The hole is marked b+ same as the red wire to the far left
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