Pentax K-R Operating Manual page 48

3
Close the battery cover.
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When using AA batteries, be sure to use the optional AA battery holder
D-BH109. (p.320)
Use four AA lithium batteries, AA Ni-MH rechargeable batteries, or AA
alkaline batteries.
Available Batteries Characteristics
AA lithium batteries Recommended when using the camera in cold climates.
AA Ni-MH These are rechargeable and are economical.
rechargeable A commercially available battery charger that is
batteries compatible with the batteries is required.
These are easily obtainable when the batteries you are
using run out but they may not support all the camera
AA alkaline batteries functions under certain conditions. We do not recommend
using them except in emergencies or when checking the
camera functionality.