Originally posted by delegopa
Actually, I use Ni-Zn from time to time in my K30. The voltage is below that of Li-On which is a good start. As you can not choose it as batterytype in the settings there could still be issues.
I'm guessing that the only issue one will encounter in the use of Ni-Zn is that the camera may have an erroneous estimate of remaining battery life while in use. But this should be a non-issue as I find Pentax' estimate of remaining battery life a bit crude, because they're using bars instead of percentages.