Samsung Galaxy S7 Bloated Battery
The Galaxy S7
Samsung Galaxy S7 and Samsung Galaxy S7 Edge are Android smartphones manufactured and marketed by Samsung Electronics. The S7 series serves as the successor to the Galaxy S6, S6 Edge and S6 Edge+ released in 2015. The phones were officially unveiled on 21 February 2016, during a Samsung press conference at Mobile World Congress, with a European and North American release on 11 March 2016.
This S7 was dropped hard, smashing the rear case and causing the battery to fail. After the drop the S7 wouldn't charge or stay on for very long, the most likely reason for bad batteries in these devices is because a small piece of foil ruptures with shock and causes the two electrodes of the battery to touch, overheat, and create problems.
Unless you're really comfortable working with at-risk lithium batteries. If the battery bends a fraction of a millimetre too much, you could rupture that same small piece of foil and start a chemical fire or explosion. This problem has only been intensified with the S7 Edge as that foil simply failed too easily.
Fortunately, there was no exploding batteries or damage apart from a very bloated battery. The S7 was back to fully working condition soon after a new battery was installed.