I needed one more battery for my Quanum Novas. On the advice of a RCGroups forum member, I purchased Vant 3000mah 11.1v 3s 30c-60c Lipo Battery. It's much shorter and fits perfectly. It's smaller than my Turnigy 2700mah batteries and even about 5 grams lighter than those. Actually, it's about the same size my Predator 2200mah battery. It will fit without raising the PDB or removing lower black foam strips in battery compartment. The link above is to the one I bought with the required XT-60 connector pre-soldered-on and ready to go.
Weight: 6.8 oz / 192.78g (including wire & plug)
Dimensions LxWxH: 100.3 x 34.6 x 25.7 mm
Dimensions w/ Wires folded at end of pack: 103.5 x 34.6 x 25.7 mm
On stock Nova, I got 13 minutes of flight-time. I like it.
EDIT 2016-07 : Good flight times... good battery and no puffing.