m100 wrote:
Wayne Larmon wrote:
Marco Nero wrote:
One problem in China is counterfeits. But lately the Counterfeiters have simply altered the name of their batteries to avoid the charge of "Counterfeit product".. meaning they can't be charged for the crime of producing counterfeits. These often have thinner cell walls which leads to overheating and rupture, triggering a small explosion and possibly a fire.
Marco, I was thinking about this exchange a few days ago but couldn't remember which thread it was in. Now the thread is back to being current.
Because a few weeks ago I dug out a Samsung tablet that I only use to measure spectrums with ArgyllPro ColorMeter. I hadn't needed to do this for a while. When retrieved the tablet I said "holey moley!" Because it was bulging all over. The screen was bent like an archery bow.
I did some quick Google research and found was that the battery had turned into a "spicy pillow" More examples on this reddit spicy pillows thread.
I didn't think to take pics of my own tablet when it was in that state but it would have fit right into that reddit thread. I did a bit more Google research and learned how to replace the battery, so now my tablet flat and unbowed. (It worked fine with the spicy pillow battery but was difficult to hold.) I took pics just now of the Samsung OEM spicy pillow I removed from my tablet:


The battery, of course, is supposed to be thin enough to fit in a tablet.
As I indicated before in our previous discussion, OEM batteries can fail badly also.
Wayne
That is one of the main reasons I like my Li-ion cells in little metal cans.
Samsung is counting on the tablet to keep the battery compressed instead of little metal cans ?
It doesn't matter if the battery is in a metal can or foil pouch. If it needs to be compressed, it has failed. At least with the foil pouch, the gradual expansion is a clear indicator things have failed. With cylindrical cells, the only visual clue is when they turn into a Roman candle.