Is this LEGO set rare?

Yes, this is a single-piece set from the 1992 Technic theme, making it quite rare.

What is the theme of this box?

The theme for this set is Technic.

This LEGO Battery Box (9860-1) contains only 1 piece.

Name: LEGO Battery Box (4.5 Volt) (9860-1)
Brand: LEGO

Technic

Technic · 1992

Theme · TechnicPieces · 1Set Number · 9860-1Year · 1992

Used

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New / Sealed

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Is this LEGO set rare?: Yes, this is a single-piece set from the 1992 Technic theme, making it quite rare.
What is the theme of this box?: The theme for this set is Technic.
How many pieces are in this set?: This LEGO Battery Box (9860-1) contains only 1 piece.