Sony ERS-220 Manual

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