I just set up a new public Signal number on this old cheap Android phone that has a battery that's ballooning out so much the case doesn't really fit on it 
What to do with a swollen battery

Removal and disposal of a swollen battery can be dangerous, but leaving a swollen battery inside a device can also cause serious harm. Read all warnings carefully and proceed at your own risk. All batteries are hazardous waste and must be disposed of properly.

iFixit
@micahflee those are some quality #DangerPillow images there...