Hi, i have a inferno with the bct tube tank. My inferno came with 2 batteries i believe that the longer ine is a 900 mah and the shorter one is like a 650, however my bct doesnt fit the longer one. Also i was wondering if any one could help me out with advice on matching the batteries or what not for my bct and why the longer one doesnt screw in to my bct. All comments welcome. Thank you