I have 8, just placed an order for 4 more, bringing me to 12. I usually only buy these when they're priced $9.99 for the pack of 4 (which has become increasingly rare, hence my desire to buy more). Now, my question is, if I don't ever plan on extending my flash collection beyond 2 or 3, will I need more than 12 in the near future? I'm looking to pick up a 430EXII in the near future, and maybe 1 or 2 more.. and I don't think I'm ever going to go beyond that. Is it worth it to have 1 set of backups for every flash you own? Now, I know that the wireless triggers you attach to them also use AA's, but I figure since those don't eat up much juice, disposable alkalines would be fine. Or do you guys shove eneloops in those too?