if you are running that low of a build, probably want to look at the sony vtc4s... better cdr, somewhat lower mah rating - but if you are running a .15ohm build, you probably want to lean towards safety over lasting all day...
some great info on battery safety in Baditudes blog...
(18) Baditude's Blogs | E-Cigarette Forum
some excellent advice from Susan-S regarding dual battery box mod battery usage...
If you are going to be vaping above 75 watts I'd stick with a 30A CDR battery (Sony VTC4's).
You also need to marry your batteries.
1. Keep in pairs, use in pairs, charge in pairs.
2. Mark them 1A,1B, 2A, 2B etc.
3. Rotate them on the charger (i.e. 1st time -- 1A goes in slot 1, 1B goes in slot 2; 2nd time -- 1A goes in slot 2, 1B goes in slot 1.
4. It may be a good idea to rotate their position in your box mod as well.