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Bose QuietComfort Earbuds II troubleshooting

Bose QuietComfort Earbuds II (870730): specs (from Bose's owner's guide); reset (from Bose), and a fix for each symptom below.

Specs (from Bose's owner's guide)
IPX4 water resistance, Bluetooth 5.3, about 1 hour to charge. Each earpiece is 17.2 x 30.5 x 22.4 mm and weighs 6.24 g, and the charging case is 66.3 x 26.7 x 59.4 mm and weighs 59.8 g.

PairingOne sideNo soundDisconnectingNot chargingBattery life

Part of Bose audio model troubleshooting

Reviewed records

3 exact answers

Diagnose the exact device problem

Bose · no sound

Bose QuietComfort Earbuds II connects but has no sound

Open record Bose · ANC

Bose QuietComfort Earbuds II noise cancellation or transparency is not working correctly

Open record Bose · one side

Bose QuietComfort Earbuds II plays from only one side or channel

Open record

Confirm the model first

Which units this covers, and how to tell yours is one of them

Model numbers and patterns: 870730

Published specification

What is true of this model and changes how you fix it

Official specifications
Bluetooth 5.3, no LE Audio (a Ultra-only feature). IPX4 rated. Battery up to 6 hours per charge, 24 hours total with the charging case's three extra charges — no Immersive Audio mode, unlike the Ultra Earbuds.
Type — ANC Bluetooth earbuds (battery)
Bose's standard flagship-ANC earbuds (no Immersive Audio — that is the Ultra) with a charging case. Battery/ANC/Bluetooth and earbud-specific symptoms (fit, tips, case contacts) apply.
Fit & CustomTune
Fit bands plus ear tips, with CustomTune calibration at insertion; ANC and bass depend on the seal, so wrong-sized tips/bands are the usual cause of thin sound or weak ANC.
Case & battery
Buds charge in the case; dirty case contacts leave a bud starting low. ANC on at high volume shortens runtime.
Reset (from Bose)
Plug the case into a USB wall charger, put both earbuds in it with the lid open and hold the Bluetooth button on the back for 30 seconds. The earbuds then return to pairing mode and you reconnect through the Bose app.

Where these figures were read. support.bose.com/s/product/bose-quietcomfort-earbuds-ii/01t8c00000OydAFAAZ?language=en_US (Bose QuietComfort Earbuds II support page)

Manufacturer support for this product line. Bose Support — Product support. Official Bose product support; this key exists so qc-earbuds-2 cites its OWN articles — Bose publishes one per symptom per product.

Also read for this model. Bose — QuietComfort Earbuds II owner's guide; Bose Support — Resetting your product, QuietComfort Earbuds II.

Exact questions

Questions that only have an answer for the Bose QuietComfort Earbuds II

One of my Bose QC Earbuds II won't charge in the case.+

Clean the charging contacts — earwax and lint on the bud's contacts and the matching pins in the case are the common cause of one bud not charging, so wipe both with a dry cotton bud. Make sure the bud seats fully in its slot (a magnet should pull it in). If a bud still will not charge or connect, reset the earbuds per Bose's steps and re-pair. The buds also pair to each other, so a dropped link between them can leave one silent.