Sony ERS-311 Mode D'emploi page 30

Charging the battery pack
You can use the supplied AC adapter and the conversion plug to charge the
battery pack while it is inserted into AIBO. It is recommended that you charge
the battery pack at room temperature (10° to 30°C (50° to 86°F)). At room
temperature, it takes about 2 hours to fully charge the battery pack.
1
Connect the AC adapter to the AC adapter conversion plug
securely.
AC adapter
conversion plug
30
AC adapter