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03-12-2010, 05:39 PM   #1
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Join Date: Nov 2006
Location: Sydney, Australia
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NiZn batteries possibly not good for K-7

After reading about the higher voltage of the rechargeable NiZn batteries I decided to give tham a go in my K-7 battery grip. Their typical charged up voltage is in the order of 1.83V compared to NiMh's 1.3V(from memory) and Lithium AA's 1.63V.

After charging up the batteries, I checked the voltage and they were indeed 1.83V as advertised and so I tried them in my K-7 Battery grip and altered the battery selection type to AA Lithium (for higher voltage).

Unfortunately, when I pressed the shutter, the camera seemed to do either a double exposure/double shutter release or some other strange thing and the exposure was way overexposed. I also noted that the AF was off in that it misfocused. I even tried the "Auto Battery" select but it made no difference.

I have been advised that the voltage of the NiZn's will quickly drop back to the level of the AA Lithiums of about 1.63V after some use, but I am not happy about using them even so.

Interestingly, over at the "other forum", there have been a few who have used the NiZn's in their K-x's and have had no issue.

Anyway, just a post to warn people about using the NiZn's in their K-7 battery grip as it may not be the right battery type to use. Everything is working fine on my K-7 now after replacing the NiZn's with the propietry DLi90 bateery.

04-09-2010, 10:07 AM   #2
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Join Date: Oct 2009
Location: DC Metro, USA
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That's good to know, thanks for the tips... D-Li90 is kind of pricey, maybe I'm just spoiled by the prices of D-Li50 on sale a while ago for my K20D. Thanks for sharing!
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