USB Problems when nothing is connected

     I am running a Macbook Pro (mid 2009) with 2.26 GHz Intel Core Duo Processor and 4 GB of memory.  I am currently having issues with my mac always displaying a message of "because a usb device was drawing too much power, it is disabled." 
     I only hook up usb drives, a bluetooth usb adapter for my mouse, my Sprint HTC Evo 4G phone, and my Ipod Touch. 
     I have never seen this message unless I left my phone on and did not have the computer plugged in and it would give this message towards the end of the battery life.
     Now I am seeing it all the time, and nothing has been plugged into the usb port for a good 2 weeks.  I have tried putting it to sleep, restarting it, shutting the whole computer down and power it back up, and I did a SMC reset.  It still is displaying the message.
Ideas?
Thanks!

OGELTHORPE:  The battery condition is normal. 
eww:  I tried that.  That is the first thing I tried.
I am wondering if it has something to do in the bios.  I am not sure if SMC is the bios equivalent or not, but I feel like it is there.  With nothing plugged in, it still gives me this issue

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