Well I put the battery in the K-7 and it worked fine, and then charged both batteries and nothing. Now it will come on and the battery indicator says full, but when I press the shutter release it hums and the back screen goes red and dead battery is on the screen. Not sure but sounds like an electro magnet hum to me. Or motor humming. But regardless it is dead. I put it thru some pretty heavy shooting. Will send it back to Japan... Ahhhh
Also as a side note here. I pulled out the k-7 in the middle of a shoot when the K-5 died. I was shooting AF-C and the K-7 was the pits to put it mildly. The K-5 was nailing BIF of tiny sunbirds in the bushes... Just a great camera.
But the K-x has come back into service.
What a little gem that is. Never has given me any problems...
Don't know if I shoud buy a back up now? Will have to check the prices.