I have started investing in Milwaukee, but I'm having hard time finding answers to some questions about lithium battery maintenance and care. Here are a few questions: Does it matter when you put your battery on the charger, like if it is at 50% or 75% or 30%? Should you always discharge your batteries fully from a non demanding device, like a fan? Does it hurt to leave your battery on the charger, even after it is done charging? Does it hurt to leave your battery in your tool overnight, or over a weekend? Please help! I love Milwaukee tools, but they are expensive so I want to make sure I don't shorten their lives with bad practices.