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07-08-2012, 12:29 PM   #1
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Processor-intensive operations drain body battery even when grip battery is selected

I was playing with the digital filters on my K-5 with grip installed, and out of curiosity, I began to tax the image processor by stacking the Pastel filter (one of the most demanding filters) 20 times on the same image. The camera needed about 5-6 minutes to process and save each image. After subjecting several images to this processing, I used my multimeter to measure the voltage of the body and grip batteries and found that the grip battery was only minimally discharged, but the voltage of the body battery was significantly lower than before—even though the grip battery was selected to be used first.

This indicates that the image processor draws upon the body battery, even if the camera is set to use the grip battery first. Loads from the sensor, motors, etc. are drawn upon the selected battery. This doesn't appear to be abnormal, but is simply an observation. The manual does note that "regardless of the [Select Battery] setting, both batteries are slightly used" (page 306).

Questions, thoughts, or comments?


Last edited by bwDraco; 07-08-2012 at 12:42 PM.
07-08-2012, 12:44 PM   #2
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I think the setting only lets you set the priority, but doesn't make any guarantees. I also think that the body battery is exclusively used at startup, as I've never had much success with an empty body battery but a full grip battery.

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