Does LiFePo4 18650 risk exploding if used while wasted?

[vodk1c3]

Still a bit unsure of that result because IMAX B6 is rubbish;

But I think that the string will not revive.
It does charge at 3.36v and somewhat hold it but capacity and IR seem really bad even at 1A discharge.

Every other strings are holding 3.6v really good.

For now I will think of what will be the next step. Here are some options :

1. Screw the BMS and charger. Buy a nice charger that will be good for other project (3010b or fatboy 8 ). Remove defective string and split pack into 7s and 8s.
2. Remove string and try to hack charger/bms down for 15s. Time consuming but free. (Seen a thread for charger I think, Still no idea how to do this for a BMS)
3. Check if any good cell on this string. Replace the cells with some replacement cells from china. Not a fan of this option. I don't like those small batteries and I dont really want more.

Any other option I didn't think of here???

 

[dnmun]

i'll ask once more before i go. can you charge up that row to 3.65V with a single cell charger? how fast does it leak down? did it ever get charged up to 3.65V?

 

[vodk1c3]

Happy test ride this morning, feeling was soooo good because my leg hurt from pedaling to work

I tricked the little B6 to charge the "bad" string to 3.7v with the LiPo storage mode. Didn't go past 3.36 in LiFe charge mode :x

Discharged again, charged to 3.7v and let it sit couple of days.

From a little test yesterday and my ride today I think that everything is now back to normal !! 3.16v for all the strings after this ride!

Still don't know the root cause; will investiguate bms balancing issue and monitor voltage.

Thanks everybody for your time; really great to have your opinion. I could have ruined my battery by doing something stupid otherwise

 

[dnmun]

if it will not charge up beyond 3.36V on balance mode then the cell has a very high self discharge rate from being damaged. if you use a BMS it needs to have a higher balancing current than the self discharge rate of that row.