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.
MacBook
Lithium-ion batteries should not be run dead.
Plugged in most of the time is not bad, as long as battery is used down to 40% one a month.
Were the MBPs on during the power-down, or just sitting off and unused?
They were most likely left on. I doubt they were all shut down.
Then the batteries may have been marginial if not maintained (run down to 40% once a month on battery, then back on power).
The stress of "completely dead" was the last straw.
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.
There is a download, "coconutbattery", downloadable from "macupdate.com". Here is my display, and you will se how it can help you follow battery health:
You can get a new third party battery fairly cheap on eBay. Every MacBook from 2006 through Mid 2009 except the Late 2008 Aluminum Unibody and the Late 2009 and 2010 White Unibodies use the same A1185 battery.
Or for $129 from The Apple Store http://store.apple.com/us/product/MA566LL/A?mco=MTY3ODQ5OTY
Thanks for that data ... seems like they may need more than 2 soon.
Dead Macbook batteries
