Short answer: if your ASUS shuts off early, charges oddly, reports high wear, or shows swelling, it’s time to act. Below are clear tests to confirm battery health—and compatible replacements you can buy right now.
Browse all ASUS batteries. Search by laptop model (e.g., “X550A”, “TUF FX505”) or by the code printed on your old pack (e.g., “A41-X550A”, “B21N1329”, “C31N1912”).
Top Symptoms of a Failing ASUS Battery
- Early shutdowns: The laptop powers off at 10–40% remaining.
- Rapid percentage drops: Jumps from 60% to 20% within minutes, or erratic readings.
- Poor runtime: You now get an hour or less doing the same tasks that used to last much longer.
- Charging anomalies: Stuck at a fixed % (e.g., 60–80%), very slow charge, or “plugged in, not charging.”
- Overheating while charging: The palm rest or underside becomes unusually warm.
- Visible swelling: Bulging chassis, raised trackpad, or gaps opening along the case seams.
- Health report shows high wear: Full Charge Capacity far below Design Capacity (e.g., >25–30% wear).
Quick At-Home Tests (≈5 Minutes)
- AC unplug test: Fully boot on AC, then unplug. If it shuts off instantly or within seconds, the pack may be dead or disconnected.
- Percent sanity check: Note the % at idle for 5 minutes. If it drops >5–10% doing nothing, capacity or calibration is poor.
- Charge plateau: Plug in and watch the % for 10 minutes. If it never moves (and the charger is known-good), suspect the battery or charge circuitry.
Generate a Windows Battery Health Report (ASUS)
- Right-click Start → Windows PowerShell (Admin) or Terminal (Admin).
- Run:
powercfg /batteryreport - Open the generated
battery-report.html(path shown in the command output).
What to look for:
- Design Capacity vs. Full Charge Capacity — large gaps indicate wear.
- Recent usage and battery life estimates — confirm rapid drop-offs or short runtimes.
- Cycle count (if shown) — very high counts correlate with aging.
Rule of thumb: If wear exceeds ~25–30% and symptoms match, the battery is due for replacement.
Rule Out Charger & Power-Jack Issues
- Test with a known-good charger: If charge behavior normalizes, your original adapter or cable may be faulty.
- Inspect the DC jack/USB-C port: Loose jacks or debris cause intermittent charging that mimics battery failure.
- BIOS/UEFI charge info: Some ASUS models display battery status in firmware; check for unusual readings.
- Battery care limits: If enabled (e.g., caps at 60–80% to preserve health), this is normal—not a fault.
Swelling & Safety Checklist
- If you see any bulging or the trackpad lifts, stop using the laptop and do not charge it.
- Do not puncture or compress a swollen pack. Remove carefully (or have a professional do it).
- Recycle at an e-waste facility; never dispose of lithium batteries in household waste.
Should You Replace It?
If the laptop still meets your performance needs and only the battery is failing, replacement is the most cost-effective fix. A fresh pack restores stable power delivery and usable unplugged time, often adding years of life to the device.
Find the Correct Replacement Battery
Match by laptop model (bottom cover or “About” page) or by the printed battery part code on the old pack (e.g., “A41-X550A”, “B21N1329”, “C31N1912”).
🔎 Browse all ASUS batteries — then search by model name or part code.
FAQ
My ASUS says “plugged in, not charging.” Is the battery bad?
Not always. Battery-care limits, a weak charger, a loose jack, or firmware quirks can cause this. Test with a known-good adapter and check settings before concluding the battery is faulty.
Do I need to calibrate by draining to 0%?
No. Frequent deep discharges stress lithium batteries. An occasional full cycle can help the gauge, but don’t do it regularly.
What wear level means “replace”?
As a guideline, replace around 25–30% wear (or sooner if you see shutdowns, swelling, or unusable runtime).
Will a new battery improve performance?
It can stabilize power delivery and prevent throttling or surprise shutdowns on battery power, improving the overall experience.
Where can I buy the right battery?
Use your laptop model or the code printed on the old pack to find a match here: ASUS battery listings. Featured options above include B21N1329 (30Wh), A41-X550A (44Wh), and C31N1912 (42Wh).
Bottom Line
If your battery shows early shutdowns, erratic percentages, high wear, or any swelling, it’s time to replace it. Confirm with the Windows battery report, rule out charger issues, then fit a compatible ASUS pack and recycle the old one safely.