It's about as heavy as a Tennis Ball.
It's about nine-tenths as heavy as a Battery (C).
In other words, 2.04 ounces is 0.890 times the weight of a Battery (C), and the weight of a Battery (C) is 1.10 times that amount.(Alkaline)
A "C" size battery weighs 2.30 ounces. C batteries are typically used in medium-drain devices such as musical instruments.
It's about one-and-one-fourth times as heavy as a Golf Ball.
In other words, 2.04 ounces is 1.2590 times the weight of a Golf Ball, and the weight of a Golf Ball is 0.79430 times that amount.(per R&A USGA Rules of Golf; maximum rule weight)
According to the Rules of Golf (as approved by the United States Golf Association and the Rules Committee of the Royal and Ancient Golf Club of Saint Andrews), golf balls must weigh no more than 1.620 ounces. Golf balls are not required to have the familiar dimpled pattern, but the design has been popular since its invention in 1905 because it reduces drag while increasing lift.
It's about three-fifths as heavy as a Deck of Cards.
In other words, 2.04 ounces is 0.620 times the weight of a Deck of Cards, and the weight of a Deck of Cards is 1.60 times that amount.(ISO 216 B8 size, a.k.a. "poker size" 63 x 88 mm, 52-card deck)
A deck of 52 ISO 216 B8-size playing cards weighs 3.30 ounces. Utilizing nearly 3,700 decks, the record-holding largest card tower was built in early 2010, stood over 3.5 m (11 ft), and weighed over 8,000 ounces.
It's about one-and-seven-tenths times as heavy as a Light Bulb.
In other words, the weight of a Light Bulb is 0.590 times 2.04 ounces.(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 1.2 oz. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.
It's about two-fifths as heavy as a Battery (D).
In other words, 2.04 ounces is 0.4280 times the weight of a Battery (D), and the weight of a Battery (D) is 2.340 times that amount.(Alkaline)
A "D" size battery weighs 4.760 ounces. The D size battery is the oldest of the modern battery sizes, first invented by the National Carbon Company in 1898.
It's about two-and-a-half times as heavy as a Battery (AA).
In other words, the weight of a Battery (AA) is 0.420 times 2.04 ounces.(Alkaline)
An "AA" size battery weighs 0.850 ounces. AA batteries came into common use during World War II and were given their name by the American National Standards Institute (ANSI) Committee C18 because they were smaller than the "A" size batteries which were invented first.