I have 15 Macbooks in a computer cart in my classroom that are continuously charged if students are not using them. During the two-week holiday break, as part of an energy-saving crusade, the computer cart was unplugged (not by me). Now 2 of the laptops' batteries won't charge, and we have to replace them. Is draining the batteries when the cart was unplugged the cause? I just find it quite a coincident that two laptop batteries died on exactly the same day.
Thanks for the advice. Throughout the school day, they are usually run down, but I'm not sure how far. It makes sense that the unplugging of the cart caused the two batteries to die. I'm just happy it wasn't all of the batteries.