The batter/power light on my E5400 is blinking amber.  The laptop will not run on battery power.  My task bar power icon shows the battery to be at 89% available (plugged in, not charging).  I'm not getting much from looking at the on-line manuals for this laptop.  It's a little over 1 year old and is run in a docking station about 90% of the time. 

Thoughts?

Thanks in advance,

Steve