Volcano and Blu are the exact same thing, with ONE small difference. The atties from blu and volcano are THE SAME. The BATTERIES, however, are not. The difference is that the new volcano batteries are much less sensitive and much less prone to going off from wind and whatnot. You can actually even blow into them, and they won't set off. At least this is how the batteries I and my girlfriend purchased from them are. Blu, on the other hand, has batteries that will go off if you look at them wrong sometimes. Also, volcano's bulk discounts are nice(they're not that great though). But you probably would be better off with a 510. While I love my blu/volcano, I just don't think it's worth the price it costs when you can get something better for the same amount of money. What you're really paying for is the branding. I can get packs of 5 510 batteries for $25, which comes out to just $5 a piece. The cheapest you'll get an L88B(that's the name of the model that volcano, blu, and revolver elite are) battery for is like $8.99 unless you order from china, in which case you'll pay thru the nose for shipping anyway. So you'd have to order an ... ton of them to make up for the shipping costs, and what are you gonna do with like 100 generic L88b batteries? I hope you enjoy your volcano at least as much as I do. A lot of people say it's crap. I totally disagree with that, but I still don't think it's really worth what it costs. It should cost maybe about half what it does.
Also, blu gives you 2 atties with their kits, volcano only gives you one. But volcano has better, less sensitive batteries, and their PCC has a flashlight, a battery indicator LCD screen so you know how much power is left in it, and it shuts off automatically when it's done charging. the blu, on the other hand, has no such indicator, no flashlight, and will continue to discharge and recharge your battery until the PCC is completely drained if you don't remove the battery from the charging slot when it's done(which is sort of difficult to tell since the light never just stays off completely).