How to Replace Battery in Bose QuietComfort 35 QC35 QC35II Headphones

Does your Bose QC35 or QC35 II die early or won’t hold a charge? A new battery can bring back full listening time. This repair requires soldering.

Watch: Bose QC35 / QC35 II battery replacement

Ready to order? Grab a QC35 battery.

Usually ships within one business day from Fox Lake, IL. Small USA family business, established in 2014.

Shop the QC35 Battery: $29.99

What You’ll Need

1 replacement battery (3.7v 550mAh, three wire)

You’ll also need (not included):

Soldering iron and solder
Tweezers
Heat gun or hair dryer
Thin plastic pry tool

Step-by-Step: How to Replace the Bose QC35 / QC35 II Battery

Step 1: Remove the ear pad and mat

Pull the ear pad off the ear cup that holds the battery, then remove the fabric mat and the foam under it.

Step 2: Open the ear cup

Gently separate the inner housing from the ear cup to expose the circuit board.

Tip: Go slowly. There are thin wires and a ribbon cable inside that are easy to damage.

Step 3: Note the wire positions

Find the three battery wires soldered to the board. Take a photo or note which pad each wire color goes to before you remove anything.

Step 4: Desolder the old wires

Heat each solder joint with the soldering iron and lift the wire off with tweezers.

Step 5: Remove the old battery

On the other side of the housing, warm the battery with a heat gun to soften the adhesive, then pry the old battery out with a thin tool.

Step 6: Install the new battery

Set the new battery in the same spot and feed its wires through to the board along the same path as the original.

Step 7: Solder the new wires

Solder each wire to the same pad as the original wire of the same color, then trim any extra wire.

Tip: Don’t let the wires touch each other or bridge two pads.

Step 8: Close it up

Tuck the wires in, press the housing back into the ear cup all the way around, and reinstall the foam, mat and ear pad.

Bring your QC35s back to life.

Usually ships within one business day from Fox Lake, IL. Small USA family business, established in 2014.

Get the QC35 Battery: $29.99

Why Do Bose QC35 Batteries Die?

Lithium-ion batteries lose capacity with every charge cycle. After a few years of daily use, your QC35 runs out much sooner than it used to or won’t hold a charge at all.

Our replacement is a new 3.7v 550mAh Li-Ion battery with the same three wire connection used in the QC35 and QC35 II, always sold and shipped from the USA.