I dont think those cells are actually bad, this happen because the batteries stays for so long, those batteries are from 2012 according to the pack date, and they should be unused for an long time, and since the circuits takes some energy from the cells from the first series, starting from minus, those cells are just discharged, but with an slow charge im sure those will wake up. Also those packs in particular has at some point their firmware updated to limit their charge, because the heaters around that time, those Panasonic and Sanyo ones too.
While I could probably wake up the two low-voltage cells, I just don't really see it worth the risk given these cells are refusing to accept charge near the end of the cycle (I'm assuming you watched the testing video for these). The reason why they are getting hot is because the chemistry is refusing to store the energy and is instead releasing it as heat. The Panasonics in the other two test videos were the only Panasonics I've ever had get hot. The fact that so many packs had to be recalled due to the Sanyo cells getting hot makes me not so comfortable with using harvested Sanyos that are getting hot - considering that other laptop packs are not hard to come by.
@@CubeComputerChannel oh yes, is better avoid those cells anyway, if those gets hot and sits on 3.90 to 4.04 volts, better get those to the recycle bin. But those Sanyos with the white ring has a high sucess rate of holding an full charge. i process thousands of cells around 8 years and those heaters dont behave well, even with low discharge rates, most probably has an broken/bad quality separator, or should be Li dendrites better avoid those anyways.
I dont think those cells are actually bad, this happen because the batteries stays for so long, those batteries are from 2012 according to the pack date, and they should be unused for an long time, and since the circuits takes some energy from the cells from the first series, starting from minus, those cells are just discharged, but with an slow charge im sure those will wake up.
Also those packs in particular has at some point their firmware updated to limit their charge, because the heaters around that time, those Panasonic and Sanyo ones too.
While I could probably wake up the two low-voltage cells, I just don't really see it worth the risk given these cells are refusing to accept charge near the end of the cycle (I'm assuming you watched the testing video for these). The reason why they are getting hot is because the chemistry is refusing to store the energy and is instead releasing it as heat. The Panasonics in the other two test videos were the only Panasonics I've ever had get hot.
The fact that so many packs had to be recalled due to the Sanyo cells getting hot makes me not so comfortable with using harvested Sanyos that are getting hot - considering that other laptop packs are not hard to come by.
@@CubeComputerChannel oh yes, is better avoid those cells anyway, if those gets hot and sits on 3.90 to 4.04 volts, better get those to the recycle bin. But those Sanyos with the white ring has a high sucess rate of holding an full charge. i process thousands of cells around 8 years and those heaters dont behave well, even with low discharge rates, most probably has an broken/bad quality separator, or should be Li dendrites better avoid those anyways.