2800, sorry.
LINK. I had 3300 confused with one I was going to get for an Axim. This is a Mugen.
I can't remember where I bought it but came with a black AND a silver battery door.
Here's a
google product search too which brings up a few more with different door options. It's about twice as heavy as the stock battery and makes the phone bulkier, but it still fits in my pocket fine and I like having something to hold onto.
Originally when I was looking to get a cell phone I was going to just get a cheapo phone and an Axim from dell, but went with the 6700 instead. Since I would have ended up carrying both of those around, size wasn't really an issue, hehe. It will still fit in the stock cradle with this battery attached though.