Sony AIBO ERS-210 Manuel D'utilisation page 37

Entertainment Robot AIBO |
Replacing the battery pack
It is usual to connect the AC adapter to AIBO to charge the battery pack while
it is still inserted. You can also change the battery pack in AIBO with another
pack that has been charged on the optional Energy Station.
1 Press the pause button and wait until the chest light turns off.
Chest light
While AIBO is accessing the "Memory Stick," the battery pack lock indicator
appears red. Do not remove the "Memory Stick" during this time to prevent
damaging AIBO. The battery pack is locked until the data-saving procedure is
complete. Removing it forcibly may damage AIBO.
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