These go for about $15 at radio shack if you can find them. I bought a lot of them and won't need some, so I have about 3-4 left right now. They were made last year, and the 3 I used all work great.

They're brand new in radio shack packaging (I actually returned one to radio shack for store credit without a receipt for some molex connectors and other batteries, yeah, I'm evil)

3.6v 850ma Lithium size 1/2AA Radio shack # 23-026

I just want someone to use them, so I'm think about $7.00 each including shipping via bubble envelope inside the U.S.. Let me know at Sylentwulf@comcast.net

I also have directions for installation, which you can find easily on the net (Nobium has a good faq)