I came across an interesting article on the Samsung Galaxy Note 7 that theorized inadequate room for the battery may have caused their problems.
http://electronicdesign.com/blog/battery-safety-do-we-need-new-regulations
This reminded me of a problem I had encountered. Years ago I had purchased an MP3 player, it worked fine and still holds a charge. A few years ago I got a replacement with more memory. After a couple of years it failed to hold a charge and I had to replace the battery. While replacing the battery I noticed a piece of foam tape that cushions the battery had a folded over corner, creating a pressure point on the battery. I surmised this is why the battery failed prematurely, the pressure causing a punch-through of the separator layer, shorting out the cell.
http://electronicdesign.com/blog/battery-safety-do-we-need-new-regulations
This reminded me of a problem I had encountered. Years ago I had purchased an MP3 player, it worked fine and still holds a charge. A few years ago I got a replacement with more memory. After a couple of years it failed to hold a charge and I had to replace the battery. While replacing the battery I noticed a piece of foam tape that cushions the battery had a folded over corner, creating a pressure point on the battery. I surmised this is why the battery failed prematurely, the pressure causing a punch-through of the separator layer, shorting out the cell.
