I started hearing occasional snapping, crackling noises in my home office. There should be absolutely nothing there to make such noises.

It took me a day or two to figure out what was causing them. It turned out to be my power bank, and the snapping noises were from its casing splitting open due to pressure from the swelling lithium batteries inside.

Lithium batteries are not supposed to look puffy.

Right after I took this photo, I put the battery in a metal container to contain the fire hazard. I guess I’ll be taking a trip to the recycling centre as soon as I can.