I just had to get rid of my Anker 20,000 mAh power bank when I discovered the batteries had swelled so much that they broke open the case. Anker is a top brand, and I have no problem ordering from them again, but I will change my storage practice.
I don't know if this power bank was Lithium-Ion or Lithium-Polymer, but my hunch is Lithium-Ion. In the future, I will store these kinds of devices in fireproof containers. I have two fire bags sold for charging, but I will also add a proper metal container.
-30-
First computer 1959. Retired from my own computer company 2004.
Hardware - Expert in 1401, and 360, fairly knowledge in PC plus numerous MPU's and MCU's
Major Languages - Machine language, 360 Macro Assembler, Intel Assembler, PL/I and PL1, Pascal, Basic, C plus numerous job control and scripting languages.
My personal scorecard is now 1 PC hardware fix (circa 1982), 1 open source fix (at age 82), and 2 zero day bugs in a major OS.