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  1. Q

    Can't get the right firmware for the Smart BMS assembled with my 18650 Lithium battery pack

    I purchased some 18650 Lithium battery pack Smart BMS from Aliexpress, https://www.aliexpress.com/item/32840764349.html?spm=a2g0s.9042311.0.0.252c4c4dCwfpYI. I assembled the Lithium battery pack and this Smart BMS together, and its Bluetooth feature works well. A couple of days ago, I tried the...
  2. Q

    The voltage of the 18650 cell removed from the already assembled Lithium battery pace drops quickly

    recently after fully charged the large 18650 Lithium battery pack I assembled with all brand new cells, I left the pack in my garage to test its self-discharge without any load applied. the voltage of all the parallel group of cells are quite stable, except of one parallel group of cells dropped...
  3. Q

    One parallel group of cells in a Lithium batterh pack discharged quicker after fully charged.

    last night, disassembled the battery pack, cut off the nickel strips for the parallel group of cells with bad cell. let this parallel group of cells self-discharge to identify the bad cell, removed the bad cell, prepared to replace it with a good cell, and tonight just finished re-welding this...
  4. Q

    One parallel group of cells in a Lithium batterh pack discharged quicker after fully charged.

    there are plenty of Lithium cells out there for different type of applications. for RC application, it use different type of cells. for my ebike application, the current assembly design and packaging of mine is quite appropriate, and the process is slightly different from the other type of...
  5. Q

    One parallel group of cells in a Lithium batterh pack discharged quicker after fully charged.

    all the cells are brand new, please refer to my latest reply. for your view "The ability to monitor and test per-cell after bank assembly while in use will help", when the pack is assembled, only can monitor and test each parallel group of cells (i installed an external connector, similar as...
  6. Q

    One parallel group of cells in a Lithium batterh pack discharged quicker after fully charged.

    these are all brand new cells, i just finished assembling them with BMS and balancing, charging them fully and leaving them there for a few days or a couple of weeks to see their self discharge. haven't installed them in the ebikes for load test yet. for this particular group of cells in one of...
  7. Q

    One parallel group of cells in a Lithium batterh pack discharged quicker after fully charged.

    these are all brand new cells, i just finished assembling them with BMS and balancing, charging them fully and leaving them there for a few days or a couple of weeks to see their self discharge. haven't installed them in the ebikes for load test yet. for this particular group of cells in one of...
  8. Q

    One parallel group of cells in a Lithium batterh pack discharged quicker after fully charged.

    I built a few large 18650 Lithium battery packs recently, one using smart BMS and the rest using no intelligence BMS. for one battery packs using no intelligence BMS, one parallel group of cells discharge quicker than the other parallel groups of cells (when there is no load applied). for...
  9. Q

    bluetooth BMS?

    i played around and the bluetooth apps of the smart BMS work on both of my Android mobile and tablet now. can update some parameters, but some parameters calculated from these updated parameters are incorrect, but in my opinion, this may not really affect how the charge & discharge work...
  10. Q

    The 18650 Li-ion Battery pack Smart BMS mobile Apps software doesn't work via Bluetooth

    i played around and the bluetooth apps of the smart BMS work on both of my Android mobile and tablet now. can update some parameters, but some parameters calculated from these updated parameters are incorrect, but in my opinion, this may not really affect how the charge & discharge work...
  11. Q

    bluetooth BMS?

    i got the software working tonight, but it isn't stable, sometimes works, sometimes doesn't, and the software has some issues, e.g. when update the parameters and Submit, it can't update the system for some parameters. anyway the smart BMS software does work, the Bluetooth apps on my mobile...
  12. Q

    bluetooth BMS?

    I did pair the xiaoxiang BMS from my mobile phone Settings → Bluetooth, but get “Couldn't pair with xiaoxiang BMS because of an incorrect PIN or passkey”. I used my Huawei Android 5.1 and Tablet with Android 5.0 to try the old (V2.1.1011, V2.1.1022) and new version (V2.1.1024) of xiaoxiang BMS...
  13. Q

    bluetooth BMS?

    i refer to your post, unplug the balance connector (not the cables), unplug the bluetooth module from the Smart BMS PCB, then reconnect them again (leave the BMS connecting to the charger at the meantime), run the xiaoxiang app, but the software dashboard doesn't show up, while on my mobile it...
  14. Q

    The 18650 Li-ion Battery pack Smart BMS mobile Apps software doesn't work via Bluetooth

    yes, you're right. i can try to charge the packs for longer period to see the difference. i purchased a few hundreds brand new 18650 cells about half year ago, and just started to assemble them one month ago. the cells should be quite matched with each other, just a few of them slightly not...
  15. Q

    The 18650 Li-ion Battery pack Smart BMS mobile Apps software doesn't work via Bluetooth

    thank you so much for the information to share your experience. after i built the new battery packs with BMS (not smart, but with balancing) installed, i left the pack charged for about one day, and when the charger light changed from red to green, i stopped the charging, but sometimes (some...
  16. Q

    The 18650 Li-ion Battery pack Smart BMS mobile Apps software doesn't work via Bluetooth

    thanks for the information. the BMS only do the balance for the same parallel group cells, right? not balance between different parallel groups cells, right? i don't know whether the balance of the smart BMS used for this battery pack works well or not, as i haven't tried this functionality yet...
  17. Q

    The 18650 Li-ion Battery pack Smart BMS mobile Apps software doesn't work via Bluetooth

    1) I connected the 7S 30A Smart BMS, purchased from https://www.aliexpress.com/item/32840764349.html?spm=a2g0s.9042311.0.0.27424c4dJ6rzZ9, to a large 7S10P 18650 Lithium battery pack. The soldering, wiring and balance connection are all fine, and the Smart BMS can charge & discharge the battery...
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