What is inside wireless earbuds?

A pair of wireless earbuds and their charging case hold three small lithium-ion cells, two tiny speaker drivers and several circuit boards. There is little metal in them, but each cell is a fire risk in the trash, which is the main reason earbuds belong in electronics recycling.¹

Drawing of a representative pair of true-wireless earbuds, not a specific product, in their charging case on a bedside table with the lid open and the near corner cut away. The right earbud is cut in half in its cradle, showing the ear tip, a tiny dynamic driver (a magnet in a steel cup, a copper voice coil and a domed diaphragm), a small magnet in the bud above a matching magnet under the cradle, a button cell, a small board and a microphone. The case shows its battery, board, USB-C port, status LED, a lid-hold magnet in the deck and another in the lid, and the hinge spring. — A representative pair of wireless earbuds in their charging case, drawn with the lid open and a corner of the case cut away. One bud is cut in half to show its driver, its cell and its board, and the case shows its own cell, its board and the hinge.

Materials in wireless earbuds

Main materials
Material	Where it sits
Copper	Voice coils, tracks and charging pins
Steel	Hinge spring, driver cups, cell cans

Trace materials
Material	Where it sits
Cobalt	Cathodes of the three cells
Graphite	Anodes of the three cells
Lithium	Cells in the case and buds
Rare earths	Driver, cradle and lid magnets
Tin	Solder on the small boards
Silicon	Audio chips and microphones
Gold	Plating on the charging pins
Silver	Solder and board finishes
Palladium	Ceramic capacitors on the boards

What wireless earbuds of this kind most likely holds. Amounts are given in words, not weights, because content depends on the design.

How wireless earbuds are recycled

The cells in the buds are sealed in and are not meant to come out, so the buds and the case are handed in whole to a program that accepts devices containing batteries.¹ A recycler treats them as battery-containing devices: the cells are separated where that can be done, or the pieces are processed with other small lithium-ion batteries, which are discharged before they are shredded.² The cells typically use a cobalt-based cathode, and that cobalt, with the lithium, can be recovered from the shredded cell material by furnace or chemical routes.²³ Each driver commonly uses a neodymium magnet, and more small magnets hold the buds and the lid in place, but whether a given pair uses rare-earth magnets depends on its design. Recovering their rare earths would mean first separating magnets this small from everything around them.⁴⁵ The small boards and the gold-plated charging pins follow other circuit boards to a copper smelter, where the copper gathers the gold, silver and palladium.⁶

More on each stream: battery metals, magnet rare earths, precious metals.

Find them in the games and recycle them

Mine the houseWireless earbuds (main bedroom)
Sort the device wallWireless earbuds (personal electronics)
Find a recycling program near youCheck what the program accepts before you go.

Sources

Used Lithium-Ion BatteriesUS EPA
Lithium-Ion Battery RecyclingUS Environmental Protection Agency
Batteries for Electric VehiclesUS Department of Energy, Alternative Fuels Data Center, Section "Recycling Batteries", items on smelting (pyrometallurgy) and chemical leaching (hydrometallurgy)
Rare earth elements, end use and recyclabilityUSGS
Rare Earth Permanent Magnets: Supply Chain Deep Dive AssessmentUS Department of Energy, Section 2.2.5.1, printed page 20
Metal Recycling: Opportunities, Limits, InfrastructureUnited Nations Environment Programme, International Resource Panel (2013), Section 3.4.1.4 'Copper and nickel scrap smelting as part of a primary copper smelter' and Figure 42 (printed pages 112 to 113)

Reviewed November 14, 2026