I have been using Insprion 7447.
One thing I was disappointed about this product. That is the Power LED status. When the battery is fully charged - With the LED does not light no Power LED lights, I do not know my computer is in sleep or standby state.
Or when I shut down the computer also does not signal that the computer is turned off or not.

I contacted Dell support where I live. And was told that it was designed that way. I am very disappointed about this