I have always given dead lithium batteries the chance to rest, charge, then rest some more. Sometimes they come back. Maybe I was on to something. I always ass

I have always given dead lithium batteries the chance to rest, charge, then rest some more. Sometimes they come back. Maybe I was on to something. I always assumed the "never charge a truly dead lithium battery" warning was marketing nonsense to boost sales by encouraging people to discard old cells.