How do I replace my battery?

Hint 1 of 5:

The answer lies very close to where you first uncover your problem.

Hint 2 of 5:

In what room in the attic do you discover the need for a battery?

Hint 3 of 5:

The East Annex.

Hint 4 of 5:

Hmm, I wonder what those old rolls of insulation are doing here?

Hint 5 of 5:

Examine the rolls. You will find a new battery.