2.Insert four batteries into the compartment, positioning the + and - ends as shown below. Then lower the battery cover.
Note:
Do not use different types of batteries together; this can cause fire or explosion.
3.Swing the battery cover shut and hold it down while you slide it back to lock it, as shown below.
When the battery power is almost out, a low battery icon 
appears on the display panel. When the battery power
runs out, this icon blinks and the camera turns off automatically. Remove and recharge your batteries, then reinstall the batteries.
Note:
When the battery level is low, the LCD monitor turns off while the flash is being charged. When the charging is complete, the LCD monitor turns back on.
Replacing the batteries
Replace your PhotoPC 3000Z batteries when the low battery
icon 
appears on the camera’s display panel. Be sure to replace all four batteries at the same time. You can replace them with either of the following battery types.
Rechargeable AA