For you SB 800 users or any other flash for that matter: What type of batteries do you use. Do you use AA rechargeable or throw away or an external battery pack. I've been shooting a lot more with the school paper and am going through batteries like crazy. The double AA's drain really fast(both rechargeable and throw away) which sucks in the middle of a shoot and I've been thinking of buying one of those Quantum packs. Any suggestions? Thanks.