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ASUS Zenbook 3 UX390 Replacement Battery 7.7V 5050mAh C23N1606

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From $97.99 USD $119.99
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Fits Asus Zenbook 3 ultrabook models including UX390UA, UX390, UX390U and 25+ variants; replaces OEM part C23N1606.
7.7V Li-Polymer pack rated 5050mAh delivers 38.89Wh total energy to restore full charge cycles on aged batteries showing capacity fade.
Connector seats flush into the Zenbook 3 battery slot with single locking tab on the right side; no adapter needed.
We bench-tested the cell on UX390 hardware; BMS accepted the pack on first insertion and voltage held steady under sustained CPU load without early cutoff.
After installation, run one full discharge to hibernation-cutoff then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on every cell swap.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.7V

Amp

5050mAh

Asus Zenbook 3 UX390UA — 7.7V Li-Polymer Replacement Battery (C23N1606)

This is a 7.7V, 5050mAh (38.89Wh) Li-Polymer replacement battery for the Asus Zenbook 3 series, including the UX390UA, UX390, and UX390U. It fits the ultra-slim chassis where the original C23N1606 cell sits flush along the base. It restores portable operation to units where the original cell has degraded or swollen.

  • UX390 series compatibility: The UX390UA, UX390U, and base UX390 all share the same battery bay geometry, connector pinout, and 7.7V charging rail. The BMS on each model communicates over the same SMBus lines, so the cell negotiates charge parameters without modification.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the UX390UA platform. The BMS initialised correctly, accepted a full charge to 8.6V, and the fuel gauge IC registered capacity without throwing a protection fault.
  • Post-install discharge cycle on the UX390UA: After fitting, run one full discharge to the automatic hibernate cutoff, then charge uninterrupted to 100%. The Zenbook 3 BIOS runs a battery learn cycle on this sequence — skipping it leaves the health indicator showing poor or unknown after every cell swap.

BIOS reporting poor battery health immediately after fitting the C23N1606

The Zenbook 3 BIOS reads health data from EEPROM registers in the battery's fuel gauge IC. A new cell ships with factory EEPROM values that don't match the charge history the BIOS expects to see. This mismatch triggers a "poor health" or "replace battery" flag even on a brand-new cell. Run one full discharge to hibernate cutoff followed by an uninterrupted charge to 100% — this writes fresh learned data to the fuel gauge IC and clears the warning. After two or three cycles the BIOS health reading stabilises.

Zenbook 3 shutting down at 20–30% charge shown on the indicator

This is a voltage cliff issue, not a fuel gauge error. Under full CPU and display load the cell voltage drops faster than the fuel gauge IC tracks, and the system hits the low-voltage cutoff before the displayed percentage reaches zero. It occurs most often after several shallow-charge cycles on a new cell before the fuel gauge is calibrated. Run a full discharge to hibernate cutoff — the system will shut down at approximately 3.0V per cell — then charge to 100% without interruption. Repeat this once more and the gauge recalibrates its empty-voltage reference.

Compatible Models

Zenbook 3 UX390UA UX390 UX390U Zenbook Flip UX390UA ZenBook UX390UA-GS046T UX390UAK ZenBook UX390UAK ZenBook UX390UA-GS031T UX390UA-GS034T UX390UA-XH74-BL UX390UA-1B ZenBook UX390UA-GS034T ZenBook UX390UA-GS063T UX390UA-GS032T ZenBook UX390UA-GS032T UX390UA-GS039T UX390UA-XH78-BL UX390UA-1C ZenBook UX390UA-GS039T UX390UA-GS046T UX390UA-GS031T UX390UA-GS063T UX390UA-1A UX390UA-GS041T ZenBook UX390UA-GS041T ZenBook UX390UA Zenbook 3 UX390UA-GS041T ZenBook 3 UX390

Replaces Part Numbers

C23N1606 0B200-02210000 0B200-02210100 C23PqCH

Technical Specifications

Voltage7.7V
Amp Hours5050mAh
Capacity5050mAh
Rate38.89Wh
Net Weight150.2g /5.30 oz
Gross Weight410.2g /14.47 oz
Approximate Weight410.2g /14.47 oz
Dimension 279.82 x 139.36 x 6.50mm

Product Highlights

  • Brand: Asus
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Zenbook 3 BIOS shows the replacement battery as "unknown" — is the cell faulty?

No. The BIOS reads identity and charge history from the fuel gauge IC's EEPROM, and a new cell ships with blank or factory-default values that the BIOS treats as unrecognised. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. That sequence triggers the BIOS learn cycle, writes the correct data back to the EEPROM, and clears the unknown status.

Why does the OS fuel gauge swing wildly between percentages for the first few days after swapping the battery?

The fuel gauge IC on the UX390UA has to build an internal model of the new cell's discharge curve — it cannot do that from the old cell's logged data. Until it completes two or three full discharge-to-hibernate and charge-to-100% cycles, the percentage reading will jump. The swings narrow noticeably after the second full cycle and settle after the third. Do not top up from partial states of charge during those first calibration cycles.

System info shows the wrong Wh rating after fitting — it reads lower than 38.89Wh. Is the capacity wrong?

The Wh figure shown in system info is pulled from a static EEPROM register on the fuel gauge IC, not measured live. That register may hold the OEM cell's rated value rather than the replacement cell's specification until the BIOS learn cycle updates it. Run two full discharge-to-100% charge cycles and check again. If the figure still reads incorrectly, open Windows PowerShell and run `powercfg /batteryreport` — the Design Capacity line will reflect the actual EEPROM value written after calibration.

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