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Hi Bob, the backup battery is just a regular watch-type battery you can get from the drugstore, etc. Just take the old one out and bring it to the store with you to get a replacement. I'd go for the more reputable ones (e.g., Duracell) as I remember awhile back someone had posted about differences between the cheaper ones and the more expensive ones. Don't forget to keep your main battery charged while you take out the backup battery. If it drains, your device will do a hard reset and be restored back to factory state.
As for your D-link card, that sounds like it's your wifi card. You will need to install the drivers for that before you are able to use the card. If you did not get an install CD with it, go to the Dlink website and look for thd drivers. This card will allow you to get on the net at hotpots and in your own wireless network, if you have one.
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