Happened to me as well. I charged both of my k-5 batteries -- grip and camera 
-- last week. I usually charge just one, and then get the other next time. I 
left each of them on the charger for a couple of hours after they were fully 
charged. Right after charging the second battery, I tried  to use the camera, I 
experienced the mirror-flop disorder. At least that's what I assume it was. The 
camera kept making a clicking noise when the shutter was pushed and wouldn't 
function. I switched off the trip, and the camera started working 
intermittently, so I turned on preview and left it on for a few minutes. After 
that it worked fin, and I was able to switch the grip back on. I'm going to go 
back to charging only one battery at a time and taking care not to overcharge. 
Or if I do charge both at once, which I have to do for big jobs, I'm going to 
make sure they don' t spend too much time on the charger, and I'm going to 
leave the grip turned off until I've logged a few shots. 

Paul
On Jun 1, 2012, at 7:31 PM, Christine Nielsen wrote:

> I have two third-party, and two pentax, batteries... they seem to work
> the same.
> 
> Once upon a time, my k-5 had mirror-flop disorder... in which the
> mirror would randomly and repeatedly actuate, rendering picture-taking
> impossible.  (It was almost like blowing up!)  There is some
> speculation that could be initiated by an over-charged battery
> disturbing the electrical ecosystem in the camera... I have no idea.
> It was never a problem in the k-7.   But, I'd caution against
> over-charging the batteries...
> 
> :)
> -c
> 
> On Fri, Jun 1, 2012 at 6:58 PM, Brian Walters <[email protected]> 
> wrote:
>> I'm sure this has been discussed before but my memory isn't what it used to
>> be....
>> 
>> Is anyone using third party batteries in their K-7/K-5?  The prices are
>> "considerably* lower than the Pentax branded ones but I don't want to blow
>> up my new camera.
>> 
>> 
>> 
>> --
>> Cheers
>> 
>> Brian
>> 
>> ++++++++++++++++++++++++++++++++++
>> Brian Walters
>> Western Sydney Australia
>> http://lyons-ryan.org/southernlight/
>> 
>> 
>> 
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