Sony AIBO ERA-210P1 Manuel D'instructions page 18

Charging a spare battery pack
You can charge a spare battery pack by inserting it into the station.
Open the cover of the station. Then insert the battery pack into the
spare battery pack insertion slot with the labeled side facing toward
you, and then close the cover.
While the battery pack is charging
The SUB BATT indicator appears in the display.
Bars in the SUB BATT indicator show the
charging level of the spare battery pack as
follows:
SUB BATT indicator
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