|If you use your eee on an external power source, then you can expect the following:|
- voltage lower than 11.5 v, the eee pc will turn to battery power. When reaching this critical voltage, the eee will start making a clicking noise, because it is switching between AC and DC power constantly. At the same you will see notification of this: The little pop-up message with battery mode and the one with AC mode will be displayed alternatively in the rhythm as the clicks.
If your eee is making clicking sounds, test the voltage of the power supply, it might be too low. When OK, check for resistance in your power cord. Is your connector getting hot? Then you have a resistance at that point and a lower voltage behind it.
Does it make a difference when you touch and wobble the connector? (eee changing to battery power) If yes, your plug doesn't fit well or the socket you plug it into is broken or has a broken soldering on the mainboard, resulting in a resistance.
I have charged the eee pc 1200HD directly on the 12V power supply of a car. In fact the voltage range of a car battery is between 11.5 and 14 volts IN MY CASE. CHECK YOUR OWN IT MIGHT BE 15V max. When the car battery voltage dropped to the 11.5 V level, I had to unplug it for the clicking noises and the flashing messages. This is normal
-Charging the eee pc with up to 14.5 v didn't damage it, but this was only possible with the eee turned off. The eee will not charge above some 13.x volts when turned on. You will see the charging indicator and the status will be "charging" but the eee will actually be consuming power from the battery and the charge will go down. Between 11.6 and 13.x (I didn´t measure it exactly) you should be able to run your eee on an external power supply and be charging the battery at the same time.
The voltage should not be under 12V but can be more than one volt higher. No Problems with 13V but clicking sounds with 11.5V