Originally posted by photosrus My K50 recently decided to give the dark picture syndrome. Having little to do today, it was playtime. Charged a Pentax battery (1050ma), a Wasabi (1400ma), and the aa adapter with 2450ma batteries. With the Pentax battery the actuator block would not work. With the Wasabi, it would work occasionally, with the aa's it worked every time. It would appear to me this is a current problem rather than a failure of the block. As the Pentax battery is nearly three years old ( as is the Wasabi), it seems they no longer have the power needed to work the block. I'd like to see someone with more experience look at this and see if that is looking in the right direction.
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You may be correct and other users have reported similar behavior. That being said, the capacity figure (mAh) printed on the battery is not an indicator of instantaneous current (coulombs/sec) without voltage drop (i.e. "power"); rather, it is the charge capacity of the battery and may be directly converted to coulombs. The two are related, but not the same. Based on other user's experience, you may expect the problem to worsen until the aperture block fails regardless of power source used.
Steve