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  1. S

    a DC-DC to charge li-ion... GREAT!!

    120vas to 3.6 vdc ? ........looked on ebay....could not find any.
  2. S

    a DC-DC to charge li-ion... GREAT!!

    There are lots of adjustable dc to dc converters on ebay from china. Also there are power supplys 120vac to 12 vdc to drive the dc-dc modules. They are not expensive. I think I may build one. A charge rate of 2 amps is plenty...even 1 amp. Also will need an 18 pin connector...male and female...
  3. S

    Battery Degradation......

    Yes, I did disconnect the battery from the controller. So it was the BMs that drained the battery. When I first built the battery I checked the BMS drain on each cell. it went from about 1 ma to 3 ma. That is why some cells ended up much lower in charge than others. Dogman, thanks for the...
  4. S

    Battery Degradation......

    Update....I charged a fully depleated cell...and it took close to the full 20 ah charge!. (It is not damaged at all ?) I am wondering why after a full charge of the battery that the battery started dropping off in voltage after only using 9 ah on a 20 ah battery. The cell previously mentioned...
  5. S

    Battery Degradation......

    I bought Lifepo4 cells and "Capacity" BMS from ebike-bmsbattery.com and built a 48v battery less than 2 yrs ago. the first yr the battery worked great. However after a winter layover i am having problems. I know that the BMS will drain the battery over time...I should have disconnected it for...
  6. S

    Capacity BMS

    Anyone have any updated info on "Capacity" type BMS's. Mine is very slow to balance and does not cut off drain current on low cell voltage. thanks...
  7. S

    BMSBATTERY PROBLEMS???

    A few months ago I received 32 cells, a bms, and a charger from ebike-bmsbattery.com (china). The bms did not work. I emailed them but they did not respond. So I resorted to ordering a new BMS (which worked). Then the charger failed after only 3 charges. I emailed them again. They responded...
  8. S

    DC - DC modules for charging ?

    I am investigating using individual dc - dc (isolated) power supply modules to charge a battery....no bms needed. one module for each cell. Are there any inexpensive... lets say...5 volts dc to 3.65 volt dc modules at maybe 2 amps available. Thanks in advance Reg G
  9. S

    Capacitance balancing BMS connection

    The procedure is to wire up the BMS connector to the battery pack......... then plug the BMS board into the connector. I have lots of experience in electronics and you should never plug a cct board into a powered connector. Problem is, there is no other way to do it. Just take your chance...
  10. S

    Capacitance balancing BMS connection

    I received a Capacity BMS from BMS Battery.com. It has the same wiring diagram as GGe5 shows. I think I made a wiring mistake (the BMS got quite warm). Ordered another one from them. Didn't receive it yet. RG
  11. S

    I think i'm gonna puke.....or cry... maybe both..

    Will the CA indicate that the battery is discharging in a case like that?
  12. S

    Help for wiring on 16 cell capacity balancing BMS ?

    OK, just got the wiring diagram from the supplier...
  13. S

    Help for wiring on 16 cell capacity balancing BMS ?

    I just received my 16 headway cells and capacity balancer from ebike-bmsbattery.com. Can anyway on here please give me information on how to connect the wires from the BMS to the battery? Thank you...
  14. S

    Reliable Battery pack supplier?

    Anyone have any experience with buying headway LiFepo4 battery packs from EV Assembly? (My lead acid battery is about done and I am ready to buy lithium.)
  15. S

    BMS confusion.....

    I have researched this forum for many hours. There seem to be many different opinions expressed. Cannot find where to obtain a stand alone BMS. I am wondering if the best way to go is to buy a (48v) battery pack complete with BMS and where the battery cells are easily replaced. (I think this...
  16. S

    Even Newer 4 to 24-cell Battery Management System (BMS)

    I am planning to assemble a 48v battery pack. What is the most recommended BMS system? Does a BMS usually include a LVC?
  17. S

    Battery Replacement...

    I have been reading topics on this forum for several hours now. It seems that most of the commercial lifepo4 battery packs have the cells welded together....making it difficult to check or replace a defective cell ? I would like to buy a commercial pack (48v) complete with bms and charger then...
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