I bought an Acer laptop a year or so ago. It sat plugged in for about 6 months, maybe a bit longer. Basically I used it in the evenings while I was watching TV.
Then we let it sit, unplugged and unused, for about 6 months.
Now when the machine is unplugged, battery power goes from 100% to shutdown in about 30 seconds.
Is the battery toast? Or is this one of those things that can be recovered from?