- Laptops
- Laptop
Slow Charger
ASUS Slow Charger on laptop: USB-C slow charging alert
Risk level
Low
Usually safe to check without specialist tools.
Urgency
Low
Quick answer
When charging via USB Type-C, a Slow Charger pop-up or an exclamation mark on the taskbar battery icon appears: ASUS says the connected charger's wattage may be insufficient. Use the bundled original ASUS adapter and run the Battery problems check in MyASUS.
Safety first
Stop and check this first
- If the adapter or cord is damaged, or if the internal battery swells (bulging case or lifted touchpad) or gets very hot, stop charging right away, never open the AC adapter or press on the battery area, and take the laptop to an ASUS service center.
- Do not mix power adapters across different ASUS laptops or handhelds even if they use USB Type-C: insufficient wattage lowers performance and can let the battery drain while plugged in.
Safe checks you can perform
- Verify you are using the bundled ASUS charger
- Check cable ends A, B, and C and try another wall outlet
- Update BIOS and run Battery problems in MyASUS
- Compare charging time in Windows Safe Mode
Leave these tasks to a qualified professional
- Do not attempt this professional task: Internal battery or charging board replacement
- Do not attempt this professional task: Original charger and USB-C port inspection at ASUS service
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Internal battery or charging board replacement
What they doIf MyASUS diagnostics or bench testing confirms a fault in the internal battery or charging circuit, the technician replaces the affected part.
They must show youthe passed Battery problems check in MyASUS System Diagnosis and the battery percentage rising normally under load.
In writingthe MyASUS diagnostic result, the part replaced, the ASUS case number, and the repair warranty.
Original charger and USB-C port inspection at ASUS service
What they doWhen the Slow Charger pop-up or battery icon exclamation mark persists even with the bundled ASUS charger, an ASUS service center inspects the adapter output and the laptop's charging port.
They must show youthe test with a known-good ASUS reference charger and the taskbar battery icon charging cleanly without the exclamation mark.
In writingthe Slow Charger warning, the wattage of the adapter tested, whether the charger or port was replaced, and the warranty coverage.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Verify you are using the bundled ASUS charger
- Who:
- you, checking the wattage label on the adapter and the port in use.
- How:
- confirm that you are using the original ASUS charger included with your laptop or a certified charger whose output power meets or exceeds your model's recommended wattage. Do not mix adapters or power cords between different ASUS products.
- Result that matters:
- ruling out an underpowered third-party or phone USB-C charger as the cause of the Slow Charger alert.
- If you were using a lower-wattage charger:
- switch to the bundled ASUS adapter and see whether the exclamation mark clears.
- If you are already using the original charger and the alert remains:
- move on to checking connections A, B, and C.
- Evidence to keep:
- a photo of the adapter's output specification label and a screenshot of the taskbar battery icon.
Evidence: Troubleshooting - An Exclamation Mark Appears on the Taskbar Battery Icon or a "Slow Charger" Message Is Displayed · Troubleshooting - Slow Charging / Battery Draining while Plugged in
Check cable ends A, B, and C and try another wall outlet
- Who:
- you, with the power adapter unplugged for a moment.
- How:
- check that the connection is not loose at the power cord plug (A), the wall outlet plug (B), or the laptop port (C), and inspect the adapter and cord for damage without ever opening the power brick. Reconnect firmly to a different wall outlet; if the battery has gone unused for a while, ASUS suggests charging it overnight.
- Result that matters:
- making sure every plug sits firmly and ruling out a weak outlet or power strip.
- If you find damage on the adapter or cord:
- stop using it and visit an ASUS service center for a replacement.
- If the cable looks intact but charging is still slow:
- update BIOS and Windows and run the MyASUS battery check.
- Evidence to keep:
- photos of ends A, B, and C and a note of which wall outlets you tested.
Evidence: Troubleshooting - Slow Charging / Battery Draining while Plugged in
Update BIOS and run Battery problems in MyASUS
- Who:
- you, in Windows with the charger plugged in.
- How:
- update the BIOS, Windows packages, and drivers via Windows Update and System Update in MyASUS. Then open MyASUS, click System Diagnosis, select Battery problems under Diagnostic Tool with the charger connected, click Check, and open Results.
- Result that matters:
- seeing whether MyASUS detects a battery or charging fault and offers automated troubleshooting steps.
- If MyASUS reports errors:
- follow the suggestions shown in Results and save a copy.
- If no errors appear but slow charging continues:
- compare charging time in Windows Safe Mode.
- Evidence to keep:
- a screenshot of the MyASUS Results screen and the installed BIOS version.
Evidence: Troubleshooting - Slow Charging / Battery Draining while Plugged in
Compare charging time in Windows Safe Mode
- Who:
- you, when you can leave the laptop charging without heavy tasks.
- How:
- boot into Windows Safe Mode as described in FAQ 1043611 and measure how long the battery takes to charge compared with normal operation in Windows.
- Result that matters:
- telling heavy background software consumption apart from a hardware charging issue.
- If charging speed is normal in Safe Mode:
- check which background apps drain power in Windows, or back up your files before resetting the PC.
- If charging is still slow or Slow Charger still appears with the original adapter in Safe Mode:
- book an inspection at an ASUS service center.
- Evidence to keep:
- the charging times recorded in Safe Mode versus normal Windows.
Evidence: Troubleshooting - An Exclamation Mark Appears on the Taskbar Battery Icon or a "Slow Charger" Message Is Displayed · Troubleshooting - Slow Charging / Battery Draining while Plugged in
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Laptops
- Brand
- ASUS
- Product type
- Laptop
Known code variants
- ASUS Slow Charger
- ASUS USB Type-C slow charger
- aviso Slow Charger
- batería agotada mientras está enchufado ASUS
- carga lenta ASUS USB-C
- Cargador lento
- Cargador lento ASUS
- exclamation mark on taskbar battery icon ASUS
- signo de exclamación en el icono de la batería ASUS
- Slow Charger pop-up
- slow charging battery draining while plugged in ASUS
What it means
In ASUS's support pages on the Slow Charger message and taskbar battery exclamation mark (FAQ 1044361) and on slow charging or battery draining while plugged in (FAQ 1043611, for Notebook and Gaming Handheld), this alert means the current USB Type-C charging equipment may not supply the recommended wattage. That can lower performance, slow down charging, or let the battery keep draining during use. Other models may differ, and the alert alone never proves the battery or charger is faulty.
Warnings and stop conditions
- Higheditorial warning
If the adapter or cord is damaged, or if the internal battery swells (bulging case or lifted touchpad) or gets very hot, stop charging right away, never open the AC adapter or press on the battery area, and take the laptop to an ASUS service center.
Evidence: Troubleshooting - Slow Charging / Battery Draining while Plugged in
- Mediumsource verified
Do not mix power adapters across different ASUS laptops or handhelds even if they use USB Type-C: insufficient wattage lowers performance and can let the battery drain while plugged in.
Evidence: Troubleshooting - An Exclamation Mark Appears on the Taskbar Battery Icon or a "Slow Charger" Message Is Displayed · Troubleshooting - Slow Charging / Battery Draining while Plugged in
Symptoms and causes
Probable causes · in order
- USB Type-C charger below the recommended wattageCommon
ASUS explains in FAQ 1044361 that the warning is triggered when the power output of the connected USB-C charger is lower than your laptop's recommended charging wattage.
Evidence: Troubleshooting - An Exclamation Mark Appears on the Taskbar Battery Icon or a "Slow Charger" Message Is Displayed
- Mixed ASUS adapters or a loose plug at ends A, B, or CPossible
FAQ 1043611 warns against mixing adapters across different ASUS products and asks you to check for loose connections at the brick plug (A), wall outlet (B), or laptop port (C).
Evidence: Troubleshooting - Slow Charging / Battery Draining while Plugged in
- High-drain background apps running in WindowsPossible
ASUS notes that some Windows applications draw heavy power while plugged in, which you can check by comparing charging speed in Safe Mode against normal Windows operation.
Evidence: Troubleshooting - Slow Charging / Battery Draining while Plugged in
- Fault that persists even with the bundled ASUS chargerLess common
If the Slow Charger warning stays on screen even when using the original ASUS charger included with the laptop, FAQ 1044361 advises visiting an ASUS service center for inspection.
Evidence: Troubleshooting - An Exclamation Mark Appears on the Taskbar Battery Icon or a "Slow Charger" Message Is Displayed · Troubleshooting - Slow Charging / Battery Draining while Plugged in
Virtual technician
Does Slow Charger still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 2
Troubleshooting - Slow Charging / Battery Draining while Plugged in
ASUS · 2026 · official_doc
- 3
Solución de problemas: carga lenta/batería agotada mientras está enchufado
ASUS · 2026 · official_doc
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