The Pentax K-5 grip comes with a tray for 6 AA's, so yes
As long as you prioritize the grip as the power source, the battery in the camera should last for months.
Even with 2 normal Li-ion batteries in both the grip and the body, you can expect to get just under 2,000 shots with a K-5, which I've found to be enough for most trips.
Adam
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