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  1. H

    48v lifepo4 battery only charging upto 50v

    hi there, as i,am with batteries from last 6 months i can say that it is pretty abnormal. my 18ah battery pack gave me around 45km at city ride it drew around 26 to 28amps@48v (SELF MADE). i am pretty sure that your BMS is the problem. but,also check your cells. even authorized manufacturers...
  2. H

    48v lifepo4 battery only charging upto 50v

    Here in India, import charges are more then 45%of total cost and we have to give bribe for customs to release it. So, I have bought it locally. Ebay doesn't work here. Only way is to buy from amazon (same sellers selling same product with triple the price) :oops: So,no other way other then...
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    48v lifepo4 battery only charging upto 50v

    That's the reason. Here, sellers will import old cells from China rewrap them and sell them on local platforms. Refund technique doesn't work as no one is responsible and seller won't even respond after purchase. No other way to get these cell other then this one way as my budget is low. It cost...
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    48v lifepo4 battery only charging upto 50v

    the pack is home made by me. the cells and bms are bought from seller
  5. H

    48v lifepo4 battery only charging upto 50v

    my pack is 18ah one and the cells are of 6ah each(15s 3p config) i have not capacity checked them as i know that they are not new cells i have no equipment to load test the cells. i doesn't even have enough money for buy cells of high quality. :( thanks for teaching me bro, now i can...
  6. H

    48v lifepo4 battery only charging upto 50v

    yes it is for LFP as seller mentioned and i have noticed. it does the same as noticed in the data sheet. thanks for your help my friend. i will discharge the pack soo low only for 1 to 2 times in a month if needed.
  7. H

    48v lifepo4 battery only charging upto 50v

    i don't know how c rating is calculated i only know some aspects about batteries. :( still learning about them. :|
  8. H

    48v lifepo4 battery only charging upto 50v

    my battery is of 15s and per cell voltage is 3.1v after bms got cut off(v 47.7v in total). bms out voltage is showing 43v but the cells are at 47.7v will discharging below 3.13v by bypassing bms will effect the cells :?: (as my controller is rated to work from 42v) the voltage sag is around...
  9. H

    48v lifepo4 battery only charging upto 50v

    its around 28 amps at max speed of 55kmph for some time (max 7 sec ). that's what i have noticed till now. cells i have used are of 3c and have 5c max rating.
  10. H

    48v lifepo4 battery only charging upto 50v

    i have checked the battery again yesterday and got around 50.1km of range :D :flame: with average speed of 28 and max speed of 55kmph. and the pack still contains so much juice (47.7V) but bms triggered because of voltage sags below 46v (bms low voltage trigger :lowbatt: ) my bms is not common...
  11. H

    48v lifepo4 battery only charging upto 50v

    i have charged them for once with bypassing BMS to know the problem and got these voltage variation. :( but after connecting bms it balanced them to safer voltages (3.4v to 3.5v ). :) and after resting it for around 2 hours the pack got down to 50.7v as usual :(
  12. H

    48v lifepo4 battery only charging upto 50v

    i think so.i have soldered thin fuses which only meant for 3 amps max(one fuse blown and one fuse disconnected). now, i changed them to 6amp max ones..
  13. H

    48v lifepo4 battery only charging upto 50v

    bro!!! i have tested the pack with my tadpole trike and got around 37km in a single charge and a top speed of 55kmph the fuses which i have soldered to cells were blown and i have reconnected to test it with my trike.. now, my battery is charging upto 51.2v (hope this 1v will give me some extra...
  14. H

    48v lifepo4 battery only charging upto 50v

    as we are in quarantine there are no shops available. i have charged every cell upto 3.6v by removing the bms from battery.. some of them got upto 4.1v with a total voltage around 54.2v. and then i have rested them for 2 hours connecting the bms. after that i checked the voltage, and got...
  15. H

    48v lifepo4 battery only charging upto 50v

    have you watched youtube channel with name (jehugrecia) :?: he also did the same 2 years back...but balanced cells with an external balancer. soldering cells will not get them damaged alot. after observing the cells for more then 4 days.. at last i get to know that the problem is with the...
  16. H

    48v lifepo4 battery only charging upto 50v

    hello, i don't think the cells are new because i got it only for 1.80$US per cell.most of them are used and imported from china. and i have to desolder the pack to keep every cell in parallel for balancing..(doesnt the 0.01v difference in cell is balanced :?: )(mine is with 0.01v difference...
  17. H

    48v lifepo4 battery only charging upto 50v

    when the seller provided the cells, they are at 3.23v with 0.01v difference.I think they are balanced... i have not checked the internal resistances of each cell before assembling. may this be a problem for fast discharge of some cells and not others :?: :shock: i have mentioned that the...
  18. H

    48v lifepo4 battery only charging upto 50v

    cells does not even getting closer to bms trigger voltage for balancing(3.65v).may be i should charge each individual cell upto 3.65v and connect them back :idea: hope this will work! i will try it soon if this remains the same. thanks for clearing my doubts my friend. hoping the same :wink:
  19. H

    48v lifepo4 battery only charging upto 50v

    as you said earlier,i have left the charger connected to battery for almost 6.5 hrs. then i checked all the 15 cell strings and got to know that all the cells are at 3.35 and only the second cell bank is at 3.43. is it normal :?: i will test the range with the trike at all type of conditions...
  20. H

    arduino based automatic derailleur

    yes, i have gone through some of them but only one of them by papagino is 80% closer to my need. he is not responding, i even private messaged him for circuit diagram. thanks for being an helping hand for every one mate :bigthumb:
  21. H

    48v lifepo4 battery only charging upto 50v

    thats great my friend.. you are awsome :warn: :warn: i have got all the cells balanced from the seller (3.2v with 0.01v difference) update: after 3 hrs of charge, now charger got cut off it self by charging the battery to 50.3v (50v stable after removing the charger) it will not decrease...
  22. H

    arduino based automatic derailleur

    i am here after searching for code on internet for so long time :warn: i am in a making of a recumbent trike which has a 6 speed cassette at back and a 28 tooth cog mounted on the motor shaft which spins max at 550rpm. it is at 1:1 ratio on first gear and attains a speed of 40kmph on load...
  23. H

    48v lifepo4 battery only charging upto 50v

    thanks for your replay. does leaving the charger for a day cause any issues with the fully charged cells :?: my controller cutoff voltage is at 42v as labeled, when i accelerate with battery at 48v it instantly drops to 46v (bms low voltage cuttoff)and bms shut down and makes overall voltage...
  24. H

    48v lifepo4 battery only charging upto 50v

    in my case, charging vpc is 3.64. and cells are settling at 3.33v. with a voltage drop of 3 to 4v in total,when accelerating the ebike bms turns off the battery without fully discharging :| i think if i get 52v instead of 50v,it can increase my range.
  25. H

    48v lifepo4 battery only charging upto 50v

    from the data sheet of bms,it is mentioned that balancing starts at 3.60+or-0.025vpc. as of bms, it should at least have to stay on 51v and 3.4vpc :bolt: . but, it only getting upto 3.35vpc :lowbatt: . :roll: i think it is not even balancing any cell because none of them reached the trigger...
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