Sony ERS-210A - Manual (Page 14)

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4
After checking that the battery pack is correctly oriented, insert it, and
then close the cover.
Hold the battery pack with the connector facing downward, and insert it into the slot
until you hear it click into place.
5
Charge up the battery pack.
Refer to the “AIBO” ERS-210 series Operating Instructions for how to charge up
the battery pack.
Push here. Attach the cover as shown in the
illustration.