If the Bose QuietComfort Ultra Earbuds or their case will not charge, the cause is usually dirty contacts, a charging cable or source that supplies too little power, or an earbud that is not seated in the case, and a short sequence of checks finds it. Start with the case. The case charges over USB-C and, in some versions, wirelessly. Plug it into a wall adapter with a known-good USB-C cable and look at the light on the case: a light that does not appear means the cable, the adapter or the case's port is the problem.
The checks in more detail
Try another cable and adapter, and avoid charging from a weak computer port. Check the case's USB-C port for lint with a flashlight, and remove it gently with a wooden toothpick with the case unplugged. Next look at the earbuds. Each bud charges through small contacts in the case, and a film of earwax, skin oil or lint stops them. Wipe the contacts in the case and on the earbuds with a dry cloth and, if needed, a cotton swab with a little isopropyl alcohol, letting them dry.
Seat each bud firmly so that its magnet pulls it into place and its light shows it is charging. A bud that is placed upside down or in the wrong side will not charge. Check that the lid closes fully. Allow time. A case that has been completely flat may take a few minutes to show a light, and a full charge takes a couple of hours. Do not charge them in hot places, since the earbuds stop charging when warm to protect the battery, and avoid charging in the cold.
Update the earbuds' firmware in the Bose Music app, since it improves battery reporting. If one earbud will not charge when the other does, swap the buds between slots to see whether the fault follows the bud or the slot. Battery life decreases over years, and short runs from a full charge suggest an old battery. If the case and buds do not charge with clean contacts and good cables, contact Bose with the serial number, as the battery is covered during warranty.
Differential
Likely causes of “Bose QuietComfort Ultra Earbuds will not charge”, and how to tell them apart
- 1
A weak cable, adapter or computer port
What separates it No light on the case
How to confirm Use a known-good cable and wall adapter
- 2
Dirty contacts
What separates it An earbud does not charge
How to confirm Clean the contacts and dry them
- 3
An earbud not seated
What separates it The light does not show charging
How to confirm Seat the bud until the magnet pulls it in
- 4
Heat or cold
What separates it Charging pauses
How to confirm Move to room temperature
- 5
An old battery
What separates it Short runs after full charge
How to confirm Contact Bose
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether the case light shows
- The cable and adapter
- Whether one bud fails
- The age of the earbuds
Try in this order
0 of 6 completedTest the cable and adapter
ReversibleUse a wall adapter.
Check the USB-C port
ReversibleFor lint.
Clean the contacts
ReversibleIn the case and on the buds.
Seat the buds
ReversibleUntil they click.
Swap the buds
ReversibleTo find the fault.
Contact Bose
ReversibleIf nothing works.
Model-specific
What is true of this model and not of its siblings
- Contacts
- Wax and lint block charging.
- Heat
- Charging pauses when warm.
Stop boundary
When this stops being a self-service repair
- !If the case and buds do not charge with clean contacts and good cables, contact Bose with the serial number
- !Stop using a swollen case
- !Update the firmware first
Evidence ledger
Sources behind this answer
Exact questions
Common questions
Why will my case not charge?+
A cable, an adapter or lint in the port.
Why does one bud not charge?+
Dirty contacts or poor seating.
Does heat affect charging?+
Yes, it pauses.
How long to fully charge?+
A couple of hours.