If you believe amnesia is a malady that effects humans, think again. Recently a Acer Aspire One netbook landed on my table with a similar problem. It refused to charge the battery, perhaps it always thinks the its battery already full. The only way you can use this machine was by connecting it the power outlet.
A quick search on the Internet will turn up a lot of Acer Aspire One (AOA) owners reporting similar problems. Quite often people update the Bios to fix this problem. However there is similar solution.
The Amber (Orange) battery light blinks constantly and netbook works only on AC power.
Follow the steps given below. (Please be careful when handling computer electrical components like batteries and AC Adapters)
- Remove the battery and hold down the power button for few seconds (to drain all remaining power)
- Power up the computer without the battery with the A/C adapter plugged in.
- Wait for few seconds and plug the battery back in
After a few tries the computer should start charging normally. The amber battery stops blinking and turn green when fully charged.