Well... plenty... firstly my brother has studied batteries so I dont need the internet to tell me but you can easily Google it.. eg
"If you believe the battery in your phone, tablet, or laptop has started to expand, unplug the device immediately if it’s plugged in, and turn it off if at all possible. Don’t charge or use it at all, because lithium-ion (Li-ion) batteries that are bulging have already bypassed built-in safeguards and are swollen with gases. Continued charging or use could lead to a runaway reaction that results in a fire or an explosion."
That’s not what I asked. I deliberately embolden the words in question where you stated it was a hardware defect.
Now, stop deflecting and please answer the question I asked, not the one I didn’t ask.