I would worry about it. The amount of time that it takes to change the
battery might be as quick as 5 seconds, if you're really good. However, is
it worth the risk?
I've changed the battery in SRAM cards while the card was in the unit or in
my PC Card slot. That way, the card is powered by the device, and you won't
lose data while you fiddle with the battery holder. I believe that many
cards come with directions to do this. On the OmniGo, this isn't *real*
easy, but the access for the battery on all of the SRAM cards I've seen are
on the end of the card that is visible. Some are secured with a screw and
need a tool or a jeweler's screwdriver to open, and others have a lock much
like the write-protect switch.
The above information is based solely on experience, not on reading the
directions. Your mileage may vary and some dis-assembly may be required.
- -Jim