Spacewalks on Flight day 4, a spare space to ground KU band antenna will be installed on the stations truss or backbone. A new tool platform on the Canada arm Dextre. And they will break the torque blot's that hold batteries on the truss to replace them on the 2nd and third space walks.
This is stuff that would have happened on the last shuttle flight to the space station
On flight day 6, three of the six batteries will get replaced and the old ones put on the cargo carrier for a return to earth. These batteries had been part of ISS for ten years.
Flight day 8 is the last spacewalk and the final three new batteries are installed on the truss.
If time permits a grapple fixture from Atlantis's payload bay will be brought inside the space station for use as a spare.
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