There should be a toll-free telephone number in all the
packing list documentation that accompanied the new parts.
That would be for Sun's Logistics Department.
They will be able to tell you what they are expecting back from you.
If you cannot find that number in all that paperwork,
then call back on the Service Case number.
Have the Sun support staff call across to Logistics and ask the question in your behalf.
( I "think" you only need to return the battery,
but you will be able to find out for sure if you call back to Sun.
This is only a discussion forum, not Sun Techsupport. )