Working on this for a customer ... idk why, it would be easier to just replace it. But anyway ... I'm not familiar with this brand/model. It will charge ok while it's turned off completely, green light on and doing what it should. But while on and plugged in, no green light. Battery status says "not charging" and the battery level slowly drops. If I unplug it while it's on, battery status changes to "discharging". Turn the unit off completely, and it will charge. Is this normal behavior for this model? Or maybe there's some other issue.