Pentax K-5 Operating Manual page 30

You can set the battery priority to the camera or the battery grip when the
optional battery grip D-BG4 (p.345) is attached.
I
2
Select [Select Battery] in the [_ Set-up 3] menu and press
the four-way controller ( • ).
The [Select Battery] screen appears.
Press the four-way controller
(•).
Battery
Use the four-way controller (• •)
to select a battery to be
prioritized and press the OK
button.
4
Priority is given to the
Auto Select battery with the most
remaining power. (default
setting)
Body First/ Priority is given to the
Grip First selected battery.
When using AA batteries in the
battery grip, use the four-way
controller (• •) to select [AA
Battery Type] and press the four-
way controller ( • ).
Select Battery
Auto Select