So i got my 30D(Thanks to all who helped with the choice). The grip comes with a battery magazine for 6 AA batteries - as you all know, and i just found out. Does anyone use this magazine?On the face of it, it doesn't seem like a bad idea. Get rechargeable batts., stick 'em in, and you don't need to spend ~$90 on an original Canon BP511. What's your take? Thanks. P.S. I did just commit to buy a 2-pack of Sterlingteks(thank you PhotoForum "search" option!) of off Ebay, but would still like to know if anyone uses said magazine and why.