Asus VivoBook S14 S433FA Replacement Battery 11.55V 4250mAh
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Asus VivoBook S14 S433FA Replacement Battery 11.55V 4250mAh - 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.
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Disclaimer
⚠️ 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.
Asus VivoBook S14 S433FA Replacement Battery 11.55V 4250mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
4250mAh
Asus VivoBook S14 S433FA Series — 11.55V Li-Polymer Replacement Battery (C31N1905)
This 11.55V, 4250mAh (49.09Wh) lithium-polymer cell replaces part number C31N1905 in the Asus VivoBook S14 and S15 range. It fits the S433FA-EB095T, S433FA-EB173T, S433FL-EB107T, S533FL-BQ051T, and over 150 additional VivoBook variants sharing the same voltage rail and connector pinout. Install it when the original cell no longer holds charge or the laptop won't run unplugged.
- VivoBook S14/S15 platform fit: All listed S433 and S533 models share the same 11.55V three-cell Li-Polymer architecture, identical 285.90 × 85.00 × 4.60mm footprint, and matching BMS handshake via the 0B200-03580200 connector assembly. One cell works across the entire bracket.
- Bench tested on actual hardware: We cycled this cell on an S433FA unit and confirmed the BMS completed its charge handshake, held steady at 11.55V nominal under display-plus-CPU load, and triggered the low-voltage cutoff cleanly without tripping a false over-discharge fault.
- Post-install recalibration on VivoBook firmware: After fitting, run the laptop down to hibernate cutoff — do not force shutdown — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning the firmware throws after every cell swap.
BIOS reporting poor battery health immediately after replacement
The VivoBook BIOS reads health data stored in the old cell's EEPROM, not from the new cell's actual charge state. When a fresh cell is installed, that EEPROM data is absent or mismatched, so the firmware flags the battery as degraded or unknown. This is not a fault with the replacement cell. Run one complete discharge-to-hibernate cycle followed by an uninterrupted full charge — after two to three cycles, the BIOS recalibrates against the new cell and clears the warning.
Laptop shuts down at 20–30% charge shown on screen
This happens because the fuel gauge IC is still referencing capacity curves from the old, degraded cell. When the new cell hits its actual low-voltage threshold under combined CPU and display load, the firmware has already miscalculated how much charge remains. The result is a sudden shutdown well above the reported zero-percent mark. Discharge the laptop fully to hibernate, charge to 100% without interruption, and repeat twice — the fuel gauge IC recalibrates its curve and the reported percentage will align with actual cell voltage, typically settling at 3.85V per cell at the 50% mark.
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
The VivoBook S433FA shows battery health as "poor" or "replace now" straight after fitting the new cell — is the cell faulty?
The cell is not faulty. The VivoBook BIOS reads health data from the EEPROM written by the original cell, and a fresh replacement has no matching data, so the firmware flags it as degraded. Run one full discharge to hibernate cutoff — do not force a shutdown — then charge uninterrupted to 100%. After two to three cycles, the BIOS learn cycle completes and the warning clears.
MyASUS or Windows is showing the wrong Wh rating for this battery — it says 50Wh or a different number than expected, is something wrong?
Nothing is wrong with the cell. The Wh value displayed in MyASUS and Windows pulls from the EEPROM design-capacity field, which can differ slightly from the cell's actual rated chemistry. This replacement is rated at 49.09Wh at 11.55V — a rounding difference of less than 1Wh from any 50Wh figure shown in software. Cross-check the voltage reading in MyASUS: a fully charged cell should read between 12.5V and 12.9V, which confirms the cell is performing correctly regardless of the displayed Wh figure.
The charge stops climbing and sits stuck at 80% — the laptop won't charge past that point after the swap.
This is almost always the BIOS charge limit feature, not a fault with the replacement cell. Asus firmware on the S433 series includes a battery care setting that caps charging at 80% to reduce long-term cell stress — it is enabled by default on some units. Open MyASUS, go to Customization, then Battery Health Charging, and switch from Balanced or Maximum Lifespan mode to Full Capacity mode. The cell will then charge to 100%.
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