You can print while the battery is charging; however, the battery may not receive a full charge.
You can also charge the handheld while it is connected to the printer. However, the batteries (printer and handheld) may not receive a full charge.
To print with the AC power adapter connected, you must have a battery inside the printer.
1.Plug the cable into the socket located on the side of
the printer as shown (under the 
symbol).
2.Connect the angle plug into the AC power adapter.
3.Plug the AC power adapter into an electrical outlet. Charging time is approximately 1.5 to 3 hours.
It will take longer to charge the battery if you are printing while charging.
