I believe that there is a bug in the Power off mode that does not allow the iPAQ 210 to correctly and fully shut down when we press the power off button. This can result in the apparent loss of power overnight due to having a CF card inserted. Here is a screen shot of my iPAQ 210 with both a Ridata 32 GB CF card and a Patriot 16 GB SDHC card inserted. As can be seen here both of these card can be inserted in the IPAQ 210 and not cause a power drain for more than six hours. This strongly suggest to me that it is NOT the HARDWARE (The Ridata 32 GB CF Card) that is causing the power drain. One more item. I have been playing with an old HawKing Compact Flash 10/100 Fast Ethernet card. The iPAQ can be shut off, (with power to CF set to off) and the card is still active. To me this strongly again suggest that the iPAQ is simply failing to shut down power to the CF slot.