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  1. H

    Bafang BBS02 750W switching off intermittently

    Yes, it's most likely the battery which is I bought on AliExpress: https://www.aliexpress.com/item/48v-triangle-e-bike-lithium-battery-pack-48v-20ah-electric-bike-battery-Free-customs-duty-48V/32785985560.html?spm=a2g0s.9042311.0.0.3bba4c4d0BI5GU. Not sure it's easy to find the defective part on...
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    Bafang BBS02 750W switching off intermittently

    Yes, the display is turning off. Your thought is that if it was the motor controller that would switch-off the motor, the display would remain on because the motor controller has no mean of turning off the display, right ? Thanks much.
  3. H

    Bafang BBS02 750W switching off intermittently

    It started when I was riding at full speed (24A current) by a very hot day (35°C) after the bike was left a full day under the sun. I switched off and on and the bike started again. I thought it was a temperature sensor that did cut the current because of excess heat. But after the...
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    Bigstone C300 LCD

    The buttons are not the issue. Sometime the unit would not switch on... (may be related to the button, though) Thanks, -Henri
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    Bigstone C300 LCD

    I am still riding a pretty old e-bike which uses a Bigstone C300 LCD display which needs to be changed. Apparently this item cannot be found any more in any store. Any idea about a compatible one ? Thanks much -Henri
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    How does a BMS work

    Very clear and lightening, thank you !
  7. H

    How does a BMS work

    Where can I find reliable and precise information on how a BMS like this one is working: https://bmsbattery.com/bmspcm/323-16s-lifepo4-bms-battery-management-system-bms-pcm.html (ideally with circuit diagram) - What does it do during charge (it is recharging fist at CC then at CV and if yes how...
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    How to charge individually an LiFePO4 cell

    I know it needs to be charged at constant current first, up to a certain voltage level and then the charge has to be completed with a contant voltage cycle. My question: where can I find an affordable power supply able to provide constant current ? Thanks, -Henri
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    Issue with Headway 40152 battery pack

    That makes sense, thank you ! Now do you know if the BMS can manage the charge of a pack with two cells at 0V and the others at 3.x V ? Thanks again, -Henri
  10. H

    Issue with Headway 40152 battery pack

    I understood that charging a LiFePO4 battery is not simple (need first to charge with constant current up to a certain voltage, then switch to contant voltage). Not an easy process... Isn't the BMS supposed to do that ? Will it manage each cell individually and treat each one according to its...
  11. H

    Issue with Headway 40152 battery pack

    The BMS I am using (from BMSbattery) - photo here below - has only P- and B- outputs on the board and a connector (second photo here below) with 16 outputs to be connected to the 16 cells. There is no documentation with the BMS and BMSbattery technical support (tech@bmsbattery.com) doesn't...
  12. H

    Issue with Headway 40152 battery pack

    Thanks for the hint. In the meantime I have disassembled the pack and measured the voltage of each cell. The first and the last cell of the pack are at 0V. And when I plug to the charger, there is only half a volt. This seems to confirm the BMS is out of work, right ? (it's brand new...). Or the...
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    Issue with Headway 40152 battery pack

    I have just finished assembling a new battery pack for my e-bike. This is a pack of 16 Headway 40152 LiFePO4 cells of 15Ah with a 16S BMS from BMAbattery. Discharge Current : 30-60A. This issue: the pack doesn't behave like a LiFePO4 battery pack. Voltage drops progressively during the discharge...
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    Troubleshooting...

    I have a Bafang BPM2 48V500W with an S12S controller from BMSbattery and a S-LCD1 E display. Here is what happened (intermittently and then permanently). When riding, the bike would go full speed regardless of pedaling or not, and regardless of throttle (frightening!!). Only the brakes could...
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    Troubleshooting an e-bike kit that stopped working

    Thanks for the hints. BMSbattery offers to ship a free controller but they said they can ship the S12P (for sensor less motors) whereas I need a S12S for a sensor motor (Bafang BPM). Still talking to them to try to understand what's behind... To Dnmun: thanks for the offer for help. Not sure at...
  16. H

    Troubleshooting an e-bike kit that stopped working

    The e-bike kit that I mounted on my bike has been working fine for two weeks (220km). Today when I started up I heard strange vibrations and noise that disappeared as I increased speed. Then I slowed down, vibrations came up again. I stopped and couldn't resume. The motor wouldn't spin. Then I...
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    S12S undocumented connectors

    Correct. Yes a momentary push button would be better. And Yes, this is good feature.
  18. H

    S12S undocumented connectors

    I suspect they have probably changed the firmware because on the version I use (received recently, a couple of weeks ago) the cruise control never goes on automatically, whichever the switch position is. Cruise control is turned on when the switch is moved from open to close position and the...
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    S12S undocumented connectors

    Here are my observations about the S12S cruise control function along with my interpretation. During the first tests in my workshop (before cutting the cruise control jumper) I maintained the throttle at the same position during ~5s and when I released it, the wheel continued to spin at...
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    S12S undocumented connectors

    Sure, I will post the results of my tests. -Henri
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    S12S undocumented connectors

    Thanks for those clarifications. I'll connect cruise control to a switch and will make sure the brake cut out switches are correctly wired and will make some tests... I guess with cruise ON, PAS has no impact (meaning speed is maintained even with no pedaling). Correct ? -Henri
  22. H

    S12S undocumented connectors

    Does anybody have S12S (BMS Battery controller) complete specifications, especially about how speed control works ? Here is a copy of an email string with BMS Battery where my questions remain largely unanswered. Thanks. My initial question: Jack Do you know what is the usage of the two...
  23. H

    8 or 10 poles PAS

    Thanks ! -Henri
  24. H

    hidden wire brake sensor... ?

    Thanks ! -Henri
  25. H

    8 or 10 poles PAS

    Can somebody tell me about the difference in usage between a 8 poles PAS and a 10 pole PAS. My common sense would tell me that 10 is better than 8 but i may be wrong... Thanks, -Henri
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