where do you get draining a li-ion is bad from? Not draining it is even worse. I know for the li-ions on laptops, if you dont charge the new ones all the way up the first few times then 100% will be below the actual full charge and if you charge it from a certain point other than it draining, then 0 stays there. For instance my battery stays on on 0 for an hour because the idiot didnt charge it right.