510 Cartos and Attys will work with the Blu
batteries, and you should not see any decrease in battery life from this. However, If you are going to use 510 Cartos and Attys I would make the recommendation that you also (at some point) move up to 510 Mega Batteries (these do come in both auto and manual) and a 510 Mega PCC. You will get roughly 3 times the battery life from those as you do your blu batts now. Granted they are longer, but if its performance you are after, this might be the way to go. Also, if you are looking for a solid 510 kit with regular size batteries (roughly 2x the life of the blu batt) and a pretty sweet PCC with all kinds of cool features check out the Magma by
Volcano. While I dont use regular batts much any more, I am seriously tempted to buy one.
EDIT: Forgot to mention that YES, the Magma is more expensive than most 510 kits you see online. Just suggesting it as an alternative to Blu as they are similar in price point.