[MetalMan]

Alex, Lipo damage comes from both overdischarge and overcharge. The main thing that causes this (when a LVC is used) is battery imbalance. If the capacity of one cell is 5% less than another, then that cell will decrease in voltage considerably more than the higher capacity cell at the end of the discharge because it doesn't have enough energy left.
The same is true for overdischarge. If a pack is out of balance, one cell can be charged to a higher voltage than the other, which can cause it to become unstable and puff up.