Like many others, my Acer One netbook decided to stop charging the battery. I first tried both suggestions listed below. Nothing worked until I updated the BIOS -- and, voila, my battery is charging. . .
Did NOT work for me but others reported success with the following:
1) Power down, remove battery, make sure a/c is plugged in, power up, let run for a few minutes, insert battery, wait for battery icon to appear on taskbar. [Some suggested trying this procedure a few times if the first time is not successful.]
2) Disconnect a/c cable and remove battery, hold power button down for 2 minutes. Reconnect a/c power and insert battery. Power on.
If you choose to update the BIOS, it's actually quite simple. Just follow the directions carefully. You will need a USB flash drive. You will need to find the steps specific to your model# here:
http://netbooks-us.custhelp.com/app/answers/list/kw/bios/r_id/166/sno/1/search/1/session/L3NpZC9uMzVhSnBGag%3D%3D
Find your BIOS update here: http://support.acer.com/
+ Select Driver Downloads
+ Select Netbook
+ Select Acer One
+ Select your model# (I found mine on the back of my laptop on a sticker that also listed the serial no.)
+ Select the BIOS tab
+ Download the BIOS zip file
+ Follow instructions
Good luck. I know how frustrating this can be!