After a while sitting, I tried to use my laptop but after plug it in no signal of life, no lights, nothing. As my wife has the same laptop I switched the a/c power but still nothing. So I open both of then to switch batteries and it worked. However now with a/c plugged it shows a red led light and the laptop shows "plugged - charging" but it is not charging at all. If I remove the battery it shuts down right away. The red led light only turns on when the it's plugged in and the battery is inserted.