Asus VivoBook X330FA-3G Replacement Battery C31N1806 11.55V
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Asus VivoBook X330FA-3G Replacement Battery C31N1806 11.55V - 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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Asus VivoBook X330FA-3G Replacement Battery C31N1806 11.55V - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
3600mAh
Asus VivoBook S13 S330 / X330 Series — 11.55V Li-Polymer Replacement Battery (C31N1806)
This is an 11.55V, 3600mAh (41.58Wh) Li-Polymer replacement battery for the Asus VivoBook S13 series, including the X330FA-3G, S330UA, and S330FA variants. It uses OEM part number C31N1806 and cross-references 0B200-02960000, 0B200-03030000, and 0B200-03030100. The three-cell flat-pack format matches the original cell footprint at 262.05 × 76.73 × 5.60mm.
- S330 and X330 platform compatibility: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol across the S330UA and S330FA sub-variants. The C31N1806 part number covers the full range because Asus used a common power rail at 11.55V across the series refresh.
- Bench tested on actual hardware: We ran this cell on an S330FA unit. The BMS initialised on first connection, the BIOS recognised the pack without prompting a health error, and charge current ramped correctly through CC/CV stages to full capacity.
- Post-install discharge cycle on the S330: After fitting, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle on the S330 platform and clears the inaccurate health warning that appears after every cell swap on these Asus units.
Why the S330 BIOS reports poor battery health immediately after a cell swap
The Asus S330 stores charge-cycle data and health metrics in EEPROM on the battery pack itself, not in the laptop firmware. When a new cell is installed, the BIOS reads zero or mismatched EEPROM data and flags the battery as degraded or unknown. This is a data-state mismatch, not a fault with the replacement cell. Running one full discharge-to-hibernate then a complete uninterrupted charge lets the EC re-learn the new cell's capacity curve and clears the warning.
Laptop shuts down at 20–30% charge shown on the S330FA
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The IC is still mapping voltage drop against the old cell's profile, so it misreads the remaining capacity and triggers a low-battery shutdown well before the cell is empty. The fix is two to three full discharge-and-charge cycles without interruption. After calibration, the gauge tracks accurately and the laptop will reach the BIOS-set cutoff voltage — typically around 10.2V under load — before shutting down.
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 Asus S330 BIOS is showing "battery health poor" straight after fitting this replacement — is the cell faulty?
It is not a fault with the cell. The S330 reads health data from EEPROM stored on the battery pack, and a new pack has no prior charge history, so the BIOS flags it as degraded. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. That single learn cycle writes fresh data to the EC and clears the warning.
Windows is showing a completely wrong Wh rating in Device Manager after installing this battery — it says something other than 41.58Wh.
The figure Windows displays is pulled from the EEPROM design-capacity field on the pack, which can differ from the actual chemistry rating depending on how the cell was provisioned. This does not affect real-world charging or discharge behaviour. Confirm the actual capacity by checking the battery report — run `powercfg /batteryreport` in an elevated command prompt and look at the "Design Capacity" versus "Full Charge Capacity" lines after two full cycles.
This replacement cell stopped charging above 80% on the VivoBook S330 — is that a battery fault?
No. Asus firmware on the S330 platform includes a BIOS-controlled charge limit that caps charging at 80% when Battery Health Charging mode is active. Open MyASUS or the ASUS Battery Health Charging utility and switch the mode from "Balanced" or "Maximum Lifespan" to "Full Capacity Mode" to allow charging to 100%.
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