That intellect 9.6 2000mah is actually the highest handguard battery I have found next to getting a lipo.
There are several on cheapbatterypacks.com and the good thing is they have measurements so you can make sure they fit accordingly.
The batteries that come from that site are flawless, i have ordered several. Mind you they took about 2 weeks or so to get to me.
Again, check the measurements.
http://eliteairsoftbatteries.com/pro...huck-pack.aspx
http://eliteairsoftbatteries.com/pro...tery-pack.aspx
http://eliteairsoftbatteries.com/pro...tery-pack.aspx