HP Photosmart A310 Compact Photo Printer - Manual (Page 14)

Bottom of printer
1 Battery compartment button: Slide to release the
compartment cover.
2 Battery compartment cover: Open this cover on the
bottom of the printer to insert the optional
HP Photosmart Internal Battery.
3 Internal battery compartment: Insert the optional
HP Photosmart Internal Battery here.
4 Internal Battery: You must purchase the battery
separately.
See page 11 for more information.
10 HP Photosmart A310 series