Lipo resistance check

[tigerman]

Have 2 6s 40000 lipos and when I check the battery resistance 5 cells had a reading of between 3 and 7 but one cell had a reading of 57 

I take it is time to replace these 2 battery. The second lipo had a reading of 5 cell again had a reading of 3 to 7 but again 1 cell had reading of 37 

[Peter Jenkins]

Don't know about others, but I would replace a pack with such a gross mismatch in cell resistance.  If you are using the pack to deliver its maximum rated current, the resistance of that one cell will drive the power loss in that cell causing it to heat up much more than the rest of the cells and could in the worst cause lead to cell failure and possibly a fire.

[tigerman]

Thanks Think it is time to dump those 2 lipos then and replace them 

[Trevor]

If two batteries are suddenly reporting similar mismatched readings it sounds like you might have a fault with your charger or, more likely the balance board

[tigerman]

I have tried it on 2 different chargers and get the same reading. To be on the safe side I will retire them. I need an excuse to try out some HRB Lipos ?

[Phil Green]

If the 'bad' cell is an end one ie cell 1 or cell 6, you can easily modify it into a 5S pack.  If its a middle cell, its a lot more work ?

 

[PatMc]

1 hour ago, tigerman said:

I have tried it on 2 different chargers and get the same reading. To be on the safe side I will retire them. I need an excuse to try out some HRB Lipos ?

If it's the same position cell on both batteries it could be that one of the chargers is reading that particular balance position lower voltage than it really is causing the cell to be overcharged when attempting to balance it. 

This once happened to me, banjaxed 3 or 4 batteries before I realised the problem.