Causes
- Dirty or oxidized charging contacts. The WF-1000XM5 case transfers power to each bud through two small gold pogo-pin terminals at the base of each charging well. Sweat, sunscreen, and hand oils that collect on the buds migrate onto these pins, and over time the contacts oxidize. Once the oxidation layer is thick enough, the circuit is interrupted and the bud stops charging even though it is seated correctly.
- A bud that isn't seated flat in its charging well. The WF-1000XM5's magnets can pull a bud in at a slight angle, so the stem contacts do not actually meet the pogo pins. The bud then shows no amber/green charging LED and slowly drains while you believe it is topping up.
- An under-powered or non-genuine USB cable/adapter. The case expects a standard 5V USB-C supply (roughly 5W+). Many phone chargers in trickle or legacy USB-A mode, or a worn third-party micro-B/USB-C cable, deliver too little current for the case to charge the buds while the case's own battery is also low — so nothing visibly changes.
- Wireless (Qi) charging coil misalignment. If you charge the case on a Qi pad, the case's coil is small and must sit centered on the pad. A thick case, a bumper, or an off-center position can leave the pad green (active) but the case battery actually draining or idle.
- Firmware or battery-management quirk. Early WF-1000XM5 firmware had occasional power-management bugs where the case reported full but stopped topping the buds, or a bud refused to accept a charge until the case was reset. This is less common than a dirty contact but is worth ruling out before assuming hardware failure.
- Internal cell or charging-circuit failure. If cleaning and reseating don't help, the case's battery or its charge controller board (or a bud's battery) has failed — a known RMA cause covered under Sony's warranty.
How to Fix
- Clean the pogo-pin contacts on both sides. Dip a cotton swab in isopropyl alcohol (70%+) and gently clean the two gold pins inside each charging well of the case, then wipe the matching metal contacts on the base of each earbud stem. Use a dry lint-free cloth to remove any residue and let the components dry for 5–10 minutes before charging. This resolves the majority of WF-1000XM5 charging failures.
- Verify each bud is seated and charging. Drop each bud into its labeled well (L and R are printed) and press down until it clicks into the magnet. Close the lid and watch the small LED through the case. Amber = charging, green = full, no light = not making contact. Wiggle the bud if there's no light, then confirm the lid is fully shut — a partially open lid keeps the case in a state where it won't energize the buds.
- Use a proper USB-C cable and adapter. Plug the case into the supplied USB-C cable and a 5V/2A (10W) or higher USB-C charger. Avoid trickle-charging from an old USB-A port or a laptop that limits current. A red or amber LED on the case confirms it is drawing power; if the case LED is completely off while plugged in, try another cable and adapter.
- Charge the case with the lid closed and buds in. The WF-1000XM5 case only charges the buds when the lid is closed. Place both buds inside, close the lid, and leave it plugged in for 20–30 minutes, then check the per-bud battery levels in the Sony Sound Connect app (tap the WF-1000XM5 → the battery screen shows each earbud plus the case).
- Reset the charging case. If a bud or the case won't respond, perform a reset: with the case open, press and hold the pairing button on the back of the case for about 20 seconds until the indicator flashes. This reboots the case's power-management controller. Then drain the case completely and recharge it to full once — this recalibrates its charge meter if it was showing a stale reading.
- Update the firmware via the Sound Connect app. If the case or buds exhibit intermittent charging, update to the latest firmware (2.0.1 or newer) through Sound Connect → Settings → About. Firmware updates addressed power-management behavior that in some units caused buds to stop accepting a charge until reset.
- Realign Qi wireless charging. If you charge wirelessly, remove any case/bumper, place the WF-1000XM5 case flat and centered on the Qi pad, and confirm the pad's LED registers the load. If the case holds charge via USB-C but not Qi, the issue is alignment (or a pad too weak for the case's coil) rather than the earbuds.
- If nothing helps, contact Sony support. When cleaning, reseating, a full reset, a firmware update, and a wired charge all fail to get the case or a bud to take power, the hardware (case battery, charge board, or a bud's cell) has failed. Request service through Sony's support portal — the WF-1000XM5 is covered by Sony's standard warranty, and a dead charging case or bud is a recognized reason for a replacement.