Direct answer
For the Bose QuietComfort Earbuds II, outlet/adapter/cable, case/dock contacts, temperature and battery condition should be isolated. First, cool to room temperature and use the specified charger.
What this covers
- Bose QuietComfort Earbuds II (870730)
- Bose product; Bluetooth multipoint, app generation, wired input and spatial/ANC features vary.
- The specific fault this record addresses: will not charge
What it does not cover
- ×The same symptom on a different Bose product line, which has its own record and its own cited source
- ×An on-screen error code whose meaning has not been checked against this exact model's manual
- ×Live electrical, gas, sealed-system, internal battery-cell or structural repair — a technician boundary, not a self-service step
Differential
What actually causes this, and how to tell them apart
These are ordered by how often each one is the answer, not by how easy it is to try. The point of the middle column is that two causes producing the same headline symptom rarely produce the same detail — that detail is what tells you which one you have before you change anything.
- 1
The charging contacts are dirty
What separates it Intermittent charging, or one earbud charging while the other does not.
How to confirm Clean both the device's contacts and the pins inside the case with a dry cotton bud. Earwax and lint compact onto these surfaces and are the most common cause on earbuds.
- 2
The device is not seated properly in the case
What separates it No charge indication, with the case closing but the device sitting slightly proud.
How to confirm Debris in the case wells prevents full seating. Clear the wells and confirm the device drops fully in and the charge indicator responds.
- 3
The cable or adapter has failed
What separates it No charging at all with a device that previously charged normally.
How to confirm Test with a different known-good cable and adapter. Cables fail internally far more often than devices do.
- 4
The battery is deeply discharged
What separates it No response at all after weeks unused.
How to confirm A deeply discharged battery may need 15–30 minutes on the charger before showing any indication. Leave it connected before concluding it is dead.
- 5
The battery is outside its safe charging temperature
What separates it Charging refuses to start after heavy use or in a cold room.
How to confirm Charging outside a safe temperature range is prevented deliberately. Let it reach room temperature and retry.
- 6
The port is blocked with lint
What separates it A cable that does not click in fully, or charges only at an angle.
How to confirm Compacted pocket lint in a USB-C port is very common. Clear it with the device powered off, using a non-metallic tool.
Before you touch a setting
Record this first — changing settings destroys the evidence
Every item below stops existing the moment a reset, re-pair or settings change is made. Written down first, they are what separates the causes above; recovered afterwards, they are guesswork.
- Whether one side charges and the other does not, which points directly at contacts rather than the cable or the case.
- Whether the device was left unused for a long period.
- Whether a different known-good cable and adapter behave the same way.
- Whether the charging port or contacts have visible debris.
Clean the charging contacts and the pins inside the case
ReversibleUse a dry cotton bud. Wax and lint on these surfaces is the leading cause on earbuds and costs nothing to rule out.
Clear the case wells and confirm the device seats fully
ReversibleDebris in the well holds the device proud so the contacts never meet.
Test with a different known-good cable and adapter
ReversibleCables fail internally far more often than devices do.
Leave it on the charger for 30 minutes before concluding it is dead
ReversibleA deeply discharged battery does not respond immediately, and this is mistaken for failure constantly.
Let the device reach room temperature and retry
ReversibleCharging is deliberately prevented outside a safe battery temperature range.
Model-specific
What is true of this model and not of its siblings
Generic advice for the product line fails here. Each item below is a property of this specific model family that changes which of the steps above apply to you.
- Model scope
- 870730. Bose product; Bluetooth multipoint, app generation, wired input and spatial/ANC features vary.
- 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.
- Power path
- Internal or removable battery. Every capability that costs current — night vision, higher stream quality, longer recordings, frequent events — is paid for in runtime, so a change in behaviour after a settings change is usually a power consequence rather than a fault. Cold weather reduces usable capacity sharply.
- Symptom boundary
- This record covers Bose QuietComfort Earbuds II when it will not charge. A different symptom on the same hardware, or this symptom on a different Bose product line, has its own record with its own causes and its own cited source.
Stop boundary
When this stops being a self-service repair
Continuing past any one of these costs more than the repair saves — in safety, in warranty, or in evidence a technician needs.
- !Stop charging and stop using anything with a swollen battery, a case that no longer closes flat, or a hot or discoloured connector.
- !Do not clean a charging port or contacts with anything metallic, and never while the device is powered.
Evidence ledger
Sources behind this answer
Visible sources support the visible claims. Home Product Support records the publisher, the fact used and the review date; community reports can suggest an issue but do not become a published fact on their own.
Where the manufacturer's article stops. Bose Support publishes this as "Product support". Official Bose product support; this key exists so qc-earbuds-2 cites its OWN articles — Bose publishes one per symptom per product. What that article does not carry is the model boundary — it is written for a product line, and 870730 is the scope applied here. Where a control label, terminal, indicator pattern or reset sequence differs on your unit, the manual for that exact model is the authority, not this page and not the article.
Exact questions
Common follow-ups
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.
One earbud charges and the other doesn't.+
That points squarely at the contacts rather than the cable or the case's own charging. Clean the metal contacts on the bud that will not charge and the matching pins in its well with a dry cotton bud — earwax and pocket lint compact onto those surfaces and insulate them, and it is the single most common cause.
My headphones are completely unresponsive.+
Leave them connected to a known-good charger for a full 30 minutes before deciding they are dead. A deeply discharged lithium battery genuinely will not show any indication immediately, and this gets mistaken for a failed device very often.
Does this answer apply to every Bose model?+
No. It is scoped to 870730. Bose product; Bluetooth multipoint, app generation, wired input and spatial/ANC features vary.
What should I record before troubleshooting not charging or case?+
Record the complete model identifier, exact message or indicator, software/firmware where visible, the operating stage and what still works.
Why is a factory reset not the first step?+
A reset can erase accounts, networks, maps, schedules or preferences without distinguishing not charging, case. The ordered checks preserve that evidence.
When should I stop and use qualified service?+
Stop for swelling, heat, odor, corrosion or damaged contacts.
Answer for the exact device and software version shown above.