I have a Milwaukee 18v impact wrench with lithium batteries. I bought this to carry in my Commander when I'm on long distance road trips in case I need to change a tire. It has no other use and I have never used it except to spin off one lugnut on my Cherokee to see if it worked. I've had it for a year and keep it stored in the house. Question is how often should I charge the batteries? I get conflicting views when I google this question.
HT