Sony WH-1000XM5 'Battery Is Empty' — What It Means

What it means

Sony WH-1000XM5 voice prompt 'Battery is empty' is the auto-shutdown warning documented on Sony's own help guide (helpguide.sony.net).
Sony's exact wording: 'When the battery becomes completely empty, a warning beep sounds, the voice guidance says "Battery is empty", and the headset automatically turns off.'
It's not a fault — it's the headset telling you it's about to power off because the battery is at the end.
The fix is simple: plug in to charge.

Affected Models

Sony WH-1000XM5 over-ear noise-cancelling headphones
Sony WH-1000XM5SA variant (Asia region)
Similar 'Battery is empty' prompt on Sony WF-1000XM5 in-ear earbuds (separate Sony help guide for that model)
Wording 'Battery is empty' is documented on Sony's help guide specifically for the WH-1000XM5
Earlier WH-1000XM series may announce battery differently — this page covers XM5 wording only

Common Causes

Headset wasn't charged for an extended period
Long noise-cancelling session ran the battery flat (NC uses ~10-15% more power)
Headset was left powered on in a bag overnight
USB-C cable is charge-only (not data) and the charge rate is too low to keep up
Battery age — older XM5 units (3+ years) hold less charge per cycle than new

How to Fix It

Plug in to charge.

Connect the USB-C cable that came with the headset to a USB-C power source.
The headset turns off automatically after the 'Battery is empty' announcement — leave it off while charging.
Sony's spec for the XM5 quick charge: about 3 minutes on an AC adapter buys you roughly 3 hours of playback, so even a short top-up gets you usable again.
Use a known-good USB-C cable and a real USB-C charger.

Cheap charge-only cables or low-output 2.5W chargers won't deliver enough power to charge the XM5 quickly.
Use a 5W or higher USB-C power adapter (the same kind you charge a phone with).
The XM5 supports up to 1A input — anything below that is slow.
Wait for the charging LED.

The status LED next to the USB-C port lights red while charging.
When the LED goes off, the headset is fully charged (about 3.5 hours from empty).
You can use the headset while it charges, but battery-empty events stress the cells, so a full charge is healthier.
Check the remaining charge from the Sony Headphones Connect app.

Open the Sony Headphones Connect app on your phone and reconnect the headset.
The app's status screen shows the current battery percentage clearly.
This is more reliable than counting voice prompts.
If voice guidance was disabled, re-enable it in the app under Settings > Voice Guidance so you hear the next 'Low battery' or 'Battery is empty' warning in time.
Replace the battery if the headset is years old.

If a fully-charged XM5 now lasts only a few hours instead of the rated 30 hours, the battery has degraded.
Sony's official repair service can replace the battery — search 'Sony WH-1000XM5 battery replacement' on sony.com/support for current options in your region.
iFixit also has battery replacement guides for those comfortable opening the headset themselves.

When to Call a Professional

'Battery is empty' never needs Sony service.
The fix is always charging the headset.
If the headset never reaches a full charge anymore after a multi-hour charge, the battery itself has degraded — at that point Sony's repair service can replace the battery, but on a 3+ year old XM5 the cost is rarely worth it compared to a new pair.

Frequently Asked Questions

Will charging right before 'Battery is empty' damage the battery?

No.
Modern Li-Ion batteries handle the empty-to-full cycle fine — what damages them is sitting at 0% for days, not the brief moment they hit 0% before being plugged in.
Charging immediately after 'Battery is empty' is actually the healthiest thing you can do.
What's bad: leaving the headset stored for months at 0% — that's when cells permanently lose capacity.
If you're putting the XM5 away for a long time, charge to about 50% before storing, and top up every few months.