Each company gives the warning on the box and in the operation instructions.
Since I am in the industry, I always present the warning.
I had a customer that used oil stain; I gave the warning of its possibility of self-combustion... he threw the rags on a ton of pellets with the plastic wrap on them... lost the garage, the RV, etc.
I felt bad, but all I could do is present the warning.
If you try to unlock sleep mode on a battery... or have a charger that is old... the safety mechanisms may not function.
Unclean contacts and loose wires (too many people pull at the cord) can also be issues... and are all covered in the owner's operation guides.
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