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  1. eva-michael

    EVE 50Ah-280Ah LiFePO4 cells from EV Components(0.58-0.4usd/Ah)

    We can provide sea shipment to door which is very cheap. For example, about 100use for 8 pcs 280Ah cells which is total 56KG. Our cells are all test before shipment. All well matching Grade A cells.
  2. eva-michael

    EVE 50Ah-280Ah LiFePO4 cells from EV Components(0.58-0.4usd/Ah)

    Brand new and Grade A cells. They are all matched and below 0.5mΩ.
  3. eva-michael

    EVE 50Ah-280Ah LiFePO4 cells from EV Components(0.58-0.4usd/Ah)

    Not include shipping yet. We are in Guangzhou. Will need to check shipping according to the delivery destination. But we are sure our cost will be low. Large quantity can arrange sea shipment.
  4. eva-michael

    EVE 50Ah-280Ah LiFePO4 cells from EV Components(0.58-0.4usd/Ah)

    Hello everyone, Recently, we have start coorperate with EVE Energy Co.,Ltd and offer EVE Prismatic LiFePO4 cells. Most of EVE cell are 1C discharge. 50Ah model is 3C discharge. They are mainly use in electric vehicles and energy storage. EVE are one of the top battery manufacturer. Their quality...
  5. eva-michael

    LiFePo4 Battery Voltage drop at high discharge

    However, high quality ev power LiFePo4 cell will give a much better performance for high current discharge. Lower quality LiFePO4(actually use cheaper LiFePO4 material and manufacture craft) is mostly rated at Max 1 C. Even though, it can handle 20C discharge, it will reduce the cycle life of...
  6. eva-michael

    LiFePo4 Battery Voltage drop at high discharge

    Single cell low voltage cut off for discharge is 2.0V for LiFePO4. That means two cell should stop discharge when it reachs 4V. Generally LiFePO4 energy discharge stage is from 3.3V to 2.0V.
  7. eva-michael

    Why Chinese Cities Are Banning

    Many big cities are crowded. In my region, driving a car will be even slower than riding a bicycle after get down from highway during commuting time. Small vehicles will be wise choice to anyplace nearby. Avoid traffic jam and no parking headache. The traffic jam is not caused by small vehicles...
  8. eva-michael

    LIfepo4 36v 15ah 4 years later 10 mile range.

    When the battery pack cut off. Check voltage of all cell. Mark voltage of each cell 1__, 2,__, 3__, 4__, 5__, 6__, 7__, 8__, 9__, 10__, 11__, 12__ In your case, healthy cells should be still around 2.9-3.2V when battery pack cut off. Find out cell which voltage drop serously. Charge battery...
  9. eva-michael

    Hub Motor Identification...

    Too hot means low efficiency of power use..... Yuma motor from China Wuxi. 2000W version is max 65kph
  10. eva-michael

    Can i use a 24V Lifepo4 charger for 24V Lion?

    Some years before, many bms builder will set single cell over charge protection voltage to 3.8-3.9V. LiFePO4 can handle this voltage without problem and this will make LiFePO4 cells have more time to balance all cells during charge step. But many users don't know and worry about it 3.9V single...
  11. eva-michael

    Can i use a 24V Lifepo4 charger for 24V Lion?

    Can use 8S LiFePO4 29.2V charger to charge 7S Li-ion. Charge curve of LiFePO4 and Li-ion are similar which is quite different from SLA battery.
  12. eva-michael

    Why Chinese Cities Are Banning

    A high speed bicycle knocked and killed a female runner when she cross motor way at yesterday night. Note: just a MTB. Ebike and bike are not guilty but sometimes people................. To protect yourself and others, take care, follow traffic rules and no traffic violation.
  13. eva-michael

    Why Chinese Cities Are Banning

    Only guidline No more than 40KG and no more than 20KM/h. ---non-motorized vehicle more than 40KG or more than 20KM/h. ---automotive vehicle But the key point is not about auto or not. But lack of management. If ebike give them too much pressure for city management, they just tend to BAND. Of...
  14. eva-michael

    Why Chinese Cities Are Banning

    Government can get a lot of tax income from large amount of cars in their city. And they are willing to enhance road situation for cars. But do not have much zeal to build road for bike, ebike or moped which do not make much tax income. China have large population and big cities have heavy...
  15. eva-michael

    Newbie charger question

    36V is just a rated voltage. It does not mean it just output directly 36V. According the the feature of chemistry of different type of battery, a suitable charge programme(Charge Curve) will be requires. Check the label in charger, it should show you a dedicated type of battery which the charger...
  16. eva-michael

    battery use or bin

    Should have been used a long enough as of its own cycle life. Puffed, high IR. ending as ebike power battery.
  17. eva-michael

    Quick BMS Question?

    In most of Lipo BMS, just like d8veh said. Most of them start balance functions during 4.12-1.15V
  18. eva-michael

    Quick BMS Question?

    Yes, it will still balances after charger is removed. BMS balances cells according the cells' voltage under BMS's monitor. Not according to if it's under charge process or not. That's the general situation for most of the bms
  19. eva-michael

    BMS 10S TESTING (cut off after riding a few seconds)

    So without bms, battery pack can be discharge properly? Do you know what's the rated discharge ampere of this BMS and the actually discharge ampere you need? If rated discharge amphere of bms is not enough, that will cause bms protection cut off. Of course, a small connection error will also...
  20. eva-michael

    Quick BMS Question?

    It monitors cells always and will continue balancing cells if cells' voltage are still different after finish charge. It stops balance after it shorten the voltage different under a appropriate range
  21. eva-michael

    BMS balance part come hot when charging and after

    So now resistor is cool or warm? If warm, find out which resistor come warm first.
  22. eva-michael

    BMS balance part come hot when charging and after

    static state should be cool. hot coffe means resistor is bleeding(keep eating energy from cells). How long have it stay? Check voltage of all cell and see if some of them are droping. If yes, you probably have a BMS connection issue, your cells are coming to more unbalance. Diagnose as my...
  23. eva-michael

    BMS balance part come hot when charging and after

    Connection from little cables(small balance wires). Double check your wiring to make sure you have not made a mistake. Use a voltage meter and check the voltage between pin(pin from can connector of small balance wires). From the 1st pin to last pin, you will see the voltage increase in almost...
  24. eva-michael

    36V Battery Not Charging

    The constant charge voltage for 10S Li-ion is DC 42V but this is the charge voltage and not the voltage of battery. The charger will push up 10S Li-ion to around 42V and then finish charge process.(If BMS set over charge protection to lower than 42V, BMS will cut off and finish charge before...
  25. eva-michael

    BMS balance part come hot when charging and after

    Resistor bleeding BMS will consume the energy of higher voltage cell by heat emission via resistor. Generally this process will stay for a while after finish charge, because BMS will still need some time to balance all cells to appropriate synchronous voltage. If the resistor keep bleeding and...
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