Dunno if this will be helpful, but there was a great topic called HOW TO CARE FOR YOUR SILVER BULLET here:
http://www.e-cigarette-forum.com/forum/altsmoke/38909-how-care-your-sb.html
probably lots of useful info about stuff not just battery related.
Altsmoke does say on their site to use
What
batteries do I use?
This unit was made to hold ONE Protected 18650 2400mAh Battery and this is the only battery that we recommend.
While they do list IMRs to buy keep in mind that IMRs are not essentially *protected* batts, just safe chemistry. You might want to ask them to clarify that. To me, protected means protected.