You know, aside from the whole overpriced part, you're lucky to have stumbled upon a pretty universal battery. I too made the mistake of initially buying an overpriced 808D-1 kit: the Cig2o starter kit itself. It was $80, and 5 packs of cartos were $15... Ridiculous! You can imagine how pleasantly surprised I was to find that at least it had 808D-1 threads, and that I could buy much cheaper cartos and batteries online.
I was in another city recently (Salt Lake) and walked into a couple smoke shops looking for 808D-1 cartos because I just wasn't in the mood to refill... By the time I got to the THIRD shop, the clerk informed me, "You really shouldn't buy e-cigarettes online because then you can't buy accessories in stores," (and he was selling all overpriced, cheapo off-brands with brand specific accessories)... Yeah, nice try pal!
So it's lucky you ended up with a universal enough battery like the KR808D-1... Especially with all the scary store-bought e-cigs out there. I echo the suggestion of Vapor4Life (v4l.com) for batteries, accessories, juices, and cartos at a great price. Their customer service is pretty awesome too. Welcome and happy vaping!