And the cells that we shipped with were pretty darn good, so sourcing the same from a random internet-site is near impossible. The charge algorithm is tuned _exactly_ for the cell that it shipped with. No, having the same formfactor and chemistry is not enough. Why? Am I chicken/boring/inept? No, because, the likelyhood of me finding the _exact_ same cell to replace the failed ones is close to impossible. Replacing the cells in a pack is _way_ beyond what their intended use is, and to be honest, I wouldn't even do it myself. Dell, Fujitsu, etc know this all too well. Ergo, as a manufacturer that takes responsibility, and actually care about our customer (and fears lawsuits), we have to make sure that the cell is not used again, as I could cause (in worst case) fires. The tolerances have been exceeded, and you're working outside of what the cell-manufacturer has tested and what the datasheet says. Once a cell has been discharged beyond a certain point (varies between cells, even within the same chemistry), it's _bad_. Quote from: stmdude on January 04, 2016, 07:52:19 pm I used to work for one of the largest home-electronics manufacturers, and I dealt quite a bit with the batteries and charging, and I can explain how we reasoned when it came to protection circuitry.
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