icecube57
10 MW
Ok so I volunteered to do some lipo recovery for someone. Cell #6 was pretty flat on every pack. One pack being at 0v. The others 1.5v ish. I found 1 pack had damage on the corner of it and the sweet smell of the electrolyte when i sniffed it. I threw it in a lipo bag and gave it a go anyway. It wasnt puffy. Got my alligator clips out and took a JST Balance cable and took the two pins for that offending cell out. Clipped on the alligator clips and check the voltage. 0v. I went through the menu and selected Nicad setting at 0.05. I opened up Log View. I started the charger up and the voltage rose. After each 0.5 volt increase i bump the current up a little bit. The thing I was noticing is the voltage would plateau and barely move so that why i bumped up the current. I finally got it above 3.0v and I stop the charge and there was a rapid decay in the voltage. It drop to about 1.3v and then it slowly dropped back down to 0. I believe the damage to the corner of the cell was causing an internal short. But anyway I did an operation and removed that cell from the pack it disposed of it.
The second pack was at 1.58v on #6 cell. It was squishy/puffed I had a little hope for this one. I did the same procedure as above. The cell was holding a charge a little bit better. There was a decay in voltage after i stop the charger but it didnt drop to far. This second time around I charged the cell up to about 3.5v a cell took it off the charger and there was a decay in the voltage but it stay up long enough for me to switch over to the BC168 charger which charges on each individual channel. After about 20-30 minutes of charging it balanced the pack supposedly but I noticed it would display a weird glitch on cell 6. It would say 4.2v and glitch down to 4.06 and say 4.2 again. Im like just great. It did close the gap but the cell still wasnt completely charged. During the charge cycle the cell was quite warm I moved it back over to the I charger and put the custom JST charge cable up to it and clipped on my alligator clips. I checked the cell IR and it was at 105Mohm. Im lay DAYUM!. That would explain the heating. So damage has been done to this pack whether it puts out full AH or not its gonna sag like a MOFO. I put it on 2A charger and the voltage shot up from 4.06 up to 4.2 good thing the charger doesn shut off until its like C/10 current. It was holding at a steady 1.6A slowly decaying down to 1.1A charge current as of right now.
The second pack was at 1.58v on #6 cell. It was squishy/puffed I had a little hope for this one. I did the same procedure as above. The cell was holding a charge a little bit better. There was a decay in voltage after i stop the charger but it didnt drop to far. This second time around I charged the cell up to about 3.5v a cell took it off the charger and there was a decay in the voltage but it stay up long enough for me to switch over to the BC168 charger which charges on each individual channel. After about 20-30 minutes of charging it balanced the pack supposedly but I noticed it would display a weird glitch on cell 6. It would say 4.2v and glitch down to 4.06 and say 4.2 again. Im like just great. It did close the gap but the cell still wasnt completely charged. During the charge cycle the cell was quite warm I moved it back over to the I charger and put the custom JST charge cable up to it and clipped on my alligator clips. I checked the cell IR and it was at 105Mohm. Im lay DAYUM!. That would explain the heating. So damage has been done to this pack whether it puts out full AH or not its gonna sag like a MOFO. I put it on 2A charger and the voltage shot up from 4.06 up to 4.2 good thing the charger doesn shut off until its like C/10 current. It was holding at a steady 1.6A slowly decaying down to 1.1A charge current as of right now.