I have the Transcend 16 GB CF and a Sandisk 8BG SDHC Card. I am embarassed to say, but one thing I noticed this morning before I left for work, was that I had about 7 Programs still running on my iPAQ...could not believe that. I have not yet installed Wisbar Advance to automatically and properly close Programs, so for now I stopped all running programs with 38% remaining. I also put both Cards back in my 210 and will see what the battery percentage is when I get home tonight. I will be really embarassed if the running Programs turns out to be the problem all along.