I found this on a forum, I don’t recall which one. But apparently, Cingular is trying to right the wrong of the super short battery life on the Blackjack and offering free extended batteries and covers.

I received mine yesterday. It does make the phone just a tad bit wider, but I guess it is worth it for when you need more battery time.

Claim your battery now before it’s too late!

https://www.web-rebates.com/cingular/blackjack/Step1.asp