The AA battery holder is a fairly simple part to add, as shown in the next photos:
First, stick an adhesive hook and loop strip on the AA battery holder as shown, then stick a strip on the robot so the AA holder can be placed just in front of the power bank. Stick it down. Do not insert the AA batteries yet.
At a pinch, sticky tack can be used for this, as the AA battery box needs to be removable to replace the cells in it.
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