Asus VivoBook 14 BX430 Replacement Battery 11.55V 4200mAh
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Asus VivoBook 14 BX430 Replacement Battery 11.55V 4200mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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.
Delivery and Shipping
Delivery and Shipping
🔹 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.
Disclaimer
Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Asus VivoBook 14 BX430 Replacement Battery 11.55V 4200mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
4200mAh
Asus BX430 Series — 11.55V Li-Polymer Replacement Battery (C31N1620)
This is an 11.55V, 4200mAh (48.51Wh) Li-Polymer battery for the Asus VivoBook 14 BX430, BX430UA, BX430UQ, and EXPERTBook P5 P5340UA, among others. It replaces OEM part numbers C31N1620, C31POJ1, 0B200-02370000, and related variants. The cell format and connector match the original bay spec — no modification needed.
- BX430 platform compatibility: The BX430UA and BX430UQ share the same 11.55V three-cell architecture and the C31N1620 BMS handshake. The BIOS expects a specific voltage profile during charge negotiation — this cell meets that profile without triggering an unknown-battery error on boot.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on BX430UA hardware. The BMS accepted the cell, charge negotiation completed normally, and the fuel gauge IC registered capacity without manual intervention.
- Post-install calibration tip: After fitting this battery, discharge the laptop fully until it hibernates, then charge uninterrupted to 100% without waking the system. This gives the fuel gauge IC a complete reference cycle against the new cell and clears the inaccurate health warning that often appears after a cell swap.
Why the BX430 shuts down at 20–30% after a battery swap
The BX430's fuel gauge IC builds its discharge model from the old cell's EEPROM data. When a new cell is installed, the IC applies the old voltage-to-capacity curve to the new chemistry. The new cell's actual voltage cliff — where voltage drops sharply under CPU and display load — sits at a different point than the stored model expects. The system interprets that voltage drop as a near-empty state and triggers shutdown. Running one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% resets the reference data and corrects the cutoff behaviour.
BIOS reporting battery health as poor immediately after fitting a new cell
The BIOS on BX430-series units reads health status from EEPROM data written during the original cell's life cycle. A new cell arrives with fresh EEPROM counters that don't match the expected wear profile the BIOS was tracking. This mismatch causes Windows and the BIOS battery screen to flag the battery as degraded or unknown — even though the cell is new. The fix is to complete a full battery learn cycle: discharge to hibernate cutoff, then charge to 100% in one uninterrupted session. After one or two cycles, the BIOS recalibrates and the health warning clears.
Compatible Models
Replaces Part Numbers
Technical Specifications
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
My BX430 shows the wrong Wh rating in Windows after fitting the new battery — is something wrong with the cell?
Nothing is wrong with the cell. Windows reads the Wh rating from the battery's EEPROM, which stores the factory-rated value from the original cell's chemistry profile. The new cell's EEPROM value may differ slightly from what Windows cached from the old battery, causing a mismatch in the power report. Run one full discharge-to-hibernate cycle then charge to 100% — the system will re-read the EEPROM and update the reported Wh figure.
The fuel gauge on my BX430 is jumping around wildly — showing 60%, then 80%, then 45% within minutes of unplugging.
This is the fuel gauge IC recalibrating against a cell it has never seen before. The IC uses a stored charge curve from the old battery to estimate remaining capacity — when that curve doesn't match the new cell's actual voltage behaviour, the readings swing erratically. It typically stabilises after two or three full discharge-to-charge cycles that give the IC enough data to build an accurate model for the new cell. Complete two uninterrupted full cycles and check whether the gauge stabilises before assuming a fault.
New battery fitted but the BX430 won't charge past 80% — stuck there even after hours on the charger.
This is almost always a BIOS-controlled charge limit, not a fault with the cell itself. Asus BX430 firmware includes a battery health charging mode that caps charge at 80% to reduce cell stress during long periods on mains power. Check the MyASUS application under Battery Health Charging and confirm the mode is set to Full Capacity Mode rather than Balanced or Maximum Lifespan. Switch it to Full Capacity Mode and the charge ceiling will lift to 100%.
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