Lipo repair

[redshift]

Way to steal my thunder- Doh!

I'll be pming you linc, something is better than nothing for sure.

[lincpimp]

Ok, so a member here sent me a few packs and I thought one would be interesting to disect and show my wonderful viewers what it looks like.

This is a maxamps 6000 2s lipo. It is a 2s2p configuration of 4 3000mah cells.

Note the non-rectangular shape, this is due to puffing of at least one of the paralleled cells. I will disect it and take some more pics as I go.

[lincpimp]

Took the shrink off.

Note that the 1st cell is very puffed, and the 2nd cell is slightly puffed. Both cells are very near 0v, so they are gone. A good rule of thumb is that if a cell is puffed it is done and needs to be disposed off. If a cell is not puffed and below 3v it may be able to be recharged. I have a technique for doing that. Also if the foil covering is torn at all the cell is done and needs to be disposed of.

On this pack the 3rd and 4th cell appear to be fine, they are a bit deformed by the puffed cell pushing on them, but should be fine. I still completely disassemble the pack and indivdually test the good cells before I make them into another pack.

I have found that maxmaps does not do the best job matching their cells. So in a paralleled stiuation you may have one cell that is stronger than the other. Now the badly puffed cell in this pack is likely a weaker cell, and it was asked to discharge a bit more than it could, and thus puffed. I have seen this alot with the 3000mah cells, as they are 15c cells at best, and even a 10th scale 2wd can draw more than they can put put out.