I think I know the answer to this but gonna ask anyway lol I have a 6S lipo battery that took a long time to balance charge today. Temp was ok and didnt get hot just took a longer time than usual to charge. I thought I would check the internal resistance of the cells and 5 were between 5 and 7 milliohms but the 6th cell is reading 37 milliohms. When I take a fully charged voltage reading 5 cells are reading 4.19-4.20 but the cell with higher internal resistance is reading 4.10-4.11.
Is this cell beyond safe limits?
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send it
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Thats what I was thinking too, and I have just the thing to send it on 
lol
I’d also want to consider the physical condition. Puffed etc…
But if on the end I’d think about making it a 5S battery after this next flight.
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Physically its a little beaten up (not excessively though) a few small dents here and there but no puffing up at all. I do currently have 1 5s pack, another to go with it isnt the worst idea actually 