I'm going to order a pair of the 230 mah batteries I linked to above. I'll post back some run times after I do some testing.
I decided to go with the 230 mah over the 300 mah because of the voltage difference. The 230's are 9.6v and the 300 are 8.4v.
I figured the LED on the mma6000 must change from green to red as the pre senses a drop in voltage to particular level. Hopefully the 230mah batteries will run in the same manner as an alkaline do, just not as long.