john61ct said:Manual balancing is easy and with quality LFP may only need doing once a year, or every 50 cycles or. . .harper said:Rassy said:No harm adjusting the voltage of an individual cell group like you are doing, but I have no idea why one group has a higher voltage. At one time you reported all cell groups were at 3.35v to 3.37v. I am still inclined to think that your BMS has some strange operating characteristics, but it seems to me that you are on top of it and should get as good of service as is possible from your battery. Good luck with it!
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
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:
Put them all in parallel no BMS, charge to 3.6 and hold until current drops to 0.01 or 0.02C
Then let them sit in parallel for at least 24hrs, 48 even better, will perfectly naturally self-balance.
Diagnostic - atomize isolated, see if any drop lower / faster than the others.
If so likely weak links, capacity testing only way to quantify for sure.
Replace if needed, reassemble pack, fresh BMS of better quality recommended.
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 from cell to cell (ex:3.34v for first and 3.35v for second)after removing from charge after 3hrs)
i dont have spot welder. so, i have soldered the cells with fusible copper wire at 4amps max. but, i have not checked the internal resistances .
i have seen someone telling that internal resistance will play a vital role in charging and discharging the cells.
(last cell pack which is at (-)terminal is discharging to 2.9v as every cell is at 3.2 when load connected)
i am with a confusion :| .
i will discharge the battery again and notice the mileage today. i will update it soon.
thanks for helping a noob and teaching new things.
thankyou so much everyone.