I'm surprised at the amount of juice you guy's seem to need for the EQ6's.
My Losmandy draws 300mAh, and my 12" LX used to draw about 400mAh I think. Both could run for a couple of nights off a 7Ah battery before I charged it.
These days I use a 40Ah SLA, but that's just so I can get 2 solid nights including laptop with webcam guiding with DSLR ... all running from the one battery.
Best thing I ever did was put a amp metre in-line so I know how much my setup is drawing all the time.