TP-755CX screen dims using battery

[manning@cs.vassar.edu (Joseph Manning)]

Hello, TP-755CX users!

   The screen on my new SVGA TP-755CX dims considerably
   whenever I remove the AC power cord and it switches to
   battery power.  This happens even when the Li-ion battery
   shows a 100% charge, and the computer is configured for
   "High Performance" under battery power.
   
   My questions:
   
     - is this normal, or do I perhaps have a weak battery?
     
     - if it is normal, then is there any way to circumvent
       this dimming, even if it shortens battery life?
   
Thanks! -- Joseph

Joseph Manning / Computer Science / Vassar College / manning@cs.vassar.edu