again, thx for the quick reply. I found this website with a couple of choices for cards with rechargable batteries. can you please tell me if they are suitable? On first sight I think they alll should work but I'm a bit confused about some descriptions like " with 2kb attribute" and the like.
my first choice would be 1 MB SRAM Card w/2KB attribute, rechargeable battery (Smart PG32004/ SR01M-15-11194), RoHS, 5V