The 5,000 milliamp hours 4S got into the propeller and the outer metal shell ripped and there is a little tiny dent in one of the silver cells.

https://drive.google.com/drive/folders/1...XjxcjVetOr

It looks like you might have got away with that. Check the internal cell resistances to see if they all look about the same and when you next charge it, do it somewhere safe and keep a close eye on it while its charging and keep checking to see of the cells start getting hotter than usual.

Thank you.

Cell one has an IR of eight, and the other three cells are at two. The battery stays cool while charging. Today it took over 2 hours to go from low voltage to storage voltage at 1A, and I think a lot of that was when it was almost at storage, so apparently it was doing the balancing for maybe for a long time.

An IR of 8 is still respectable and 2 is about the best I have seen, but the fact that one cell is 4 times the IR of the others means that it's not as healthy as the others and is likely why balance charging the cells at the end of a charge cycle is taking an eternity. It's still usable but you will just have to put up with long charging times and that cell will likely deplete a bit quicker than the others when under load and will keep drifting further out of balance compared to the others when being used.

Thank you

It's labeled as a graphene battery. It says to discharge to 3.7 volts. I have heard to discharge down to between 3.2 and 3.5. I typically fly until the OSD says land now at 3.25. Is there some reason this graphene battery would need to stay at a higher discharged voltage than a regular lipo

3.7V is the nominal voltage. You can still happily run that LiPo down to an absolute minimum of 3.0V per cell before you cause any internal damage to it. When not in use just storage charge it to 3.8V per cell as per normal.