Originally posted by hyyz Explain a bit about my observation mentioned above. It is the white latch in battery compartment that rubs the battery compartment cover. My theory is: if battery is slightly larger than nominal, it would push the latch harder and causes it to be slightly outward. If this is severe enough, the latch would touch the cover. If you look at inside of the cover, there's a recess in it to accommodate the latch. But sometimes it may not be enough. For instance, if battery is larger than nominal, or if grip flexes due to heavy lens attached, the latch can contact the cover, causing creaking noise. I confirmed this by checking the recess and found rubbing mark. So, I shaved the latch a little and solved it.
This is just my 2 cents. And this is for my K-3. Hope this might be helpful.
Checked this on mine. The problem doesn't come from the latch and cbattery cover.
And I confirm that my problem is not really a creaking but more a pop/click kind of sound when I press on the grip, or when lifting heavy lense.