Originally posted by jennverr
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I am using wasabi brand batteries. haven't had an issue before..
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Not sure whether the batteries you mention are AA or the lithium pack. If they are AA batteries then it is normal for it to tell you there is not enough battery power to lift the mirror.
I think the issue is that with AA batteries the camera is not able to get a reliable estimate of remaining battery power so it will risk running out of juice while you are cleaning the mirror. That said, for some reason it has occasionally worked for me with AA batteries but probably that is actuially when it is not working as designed.
Try again with the genuine Pentax battery and I think you shouldn't have any problem.
If you do not have one try going to the setup and find the setting 'AA battery type'. Try changing it from auto to NiMh or one of the other settings. It might work but do keep in mind that if it does work you are 'tricking' the camera to make it think the battery is fine and you might end up with the mirror closing on you if the batteries really aren't up to it.