Does it have a picture of a battery next to it?

 

The battery charge LED will flash Amber (Some people say red) if there is a problem with the battery.

 

Model of your computer, operating system, and details of EXACTLY whick LED and where it is located will get more exact answers

My laptop is an Inspiron B130 and the light is on the laptop itself. It's powered up and I'm not having problems with the battery life (that I can see anyway). Operating %)(^%^@# MS Vista. By the way, I never had this problem BEFORE installing that darn Vista.

 

The light is located on the left front...third light from the left. Even when the laptop is powered down, the light continues to blink.

 

Thanks!!!

 

http://support.dell.com/support/edocs/systems/ins1300/en/om/om_en.pdf

 

Per the owner's manual, Battery is critically lw.