Asus VivoBook X705 Replacement Battery B31N1635 11.52V 3600mAh
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Asus VivoBook X705 Replacement Battery B31N1635 11.52V 3600mAh - 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 X705 Replacement Battery B31N1635 11.52V 3600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.52V
Amp
3600mAh
Asus VivoBook 15 X705 Series — 11.52V Li-Polymer Replacement Battery (B31N1635)
This is an 11.52V, 3600mAh (41.47Wh) lithium-polymer battery for the Asus VivoBook 15 X705 series. It fits a wide range of X705 variants including the X705UV-3G, X705NC-1B, and X705UV-1B. OEM part numbers B31N1635 and B0B200-02560000 both reference this cell.
- X705 series battery platform: The X705 line shares a unified battery bay and connector across its UV, NC, and related sub-variants. All run the same 11.52V three-cell architecture with an identical BMS handshake, so one cell covers the full model spread without adapter or modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on X705UV hardware. The BMS initialised cleanly, the protection circuit responded correctly to load spikes, and the fuel gauge IC accepted the new cell without throwing error codes.
- First-cycle calibration on the X705: After fitting, run the battery down until the laptop hibernates, then charge uninterrupted to 100% without using the machine. The X705 BIOS uses that full cycle to reset the battery learn table — skipping it leaves the health indicator stuck on a reading from the old cell.
Why the X705 BIOS flags a new battery as poor health immediately after swap
The X705 BIOS stores battery health data in EEPROM tied to the original cell's charge history. When a new cell is fitted, that stored data no longer matches the new cell's actual state, so the BIOS reads the mismatch as degradation. This is not a fault with the replacement battery — it is a calibration state. Running one full discharge-to-hibernate then an uninterrupted charge to 100% triggers the BIOS battery learn cycle, which overwrites the stale EEPROM data. After one or two complete cycles, the health status clears.
X705 shutting down at 20–30% charge shown on the gauge
This is a voltage cliff issue, not a calibration issue. Under full CPU and display load, the cell voltage drops faster than the fuel gauge IC can track — the laptop hits the low-voltage cutoff before the displayed percentage reaches zero. It happens most often when the battery hasn't completed a learn cycle and the IC is still mapping capacity against the old cell's curve. Run a full discharge to hibernate-cutoff and charge back to 100% without interruption. If the shutdowns persist past two calibration cycles, check that the cell voltage at shutdown is above 9.5V total — below that points to a genuine cell fault.
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 X705 shows the battery as 0% or "unknown" right after fitting the new cell — is something wrong with it?
Nothing is wrong with the cell. The X705 fuel gauge IC is still reading EEPROM data written by the old battery, so it has no valid reference point for the new one. Run the laptop on battery until it hibernates, then charge uninterrupted to 100% — this forces the IC to map capacity against the new cell from scratch. The 0% or unknown reading clears after that first complete cycle.
Windows is showing this battery's capacity as a different Wh figure than what's printed on the cell — why don't the numbers match?
The Wh figure Windows reports is pulled from the battery's EEPROM, which stores the original factory-rated value from the cell's chemistry spec. The actual usable capacity can differ slightly from that rated figure depending on cell manufacturing tolerances and how the BMS reports state-of-charge. This is a data readout difference, not a sign the battery is faulty. After two full charge-discharge cycles, the fuel gauge IC recalculates full charge capacity based on real measured output, and the reported figure will stabilise.
The X705 charges fine but the battery gauge jumps around wildly — 60% one minute, 35% the next — for the first few days of use.
The fuel gauge IC needs several full cycles to build an accurate capacity curve against the new cell. Until it has that data, state-of-charge estimates are interpolated from the old cell's discharge profile, which causes the erratic jumps. Run two to three complete discharge-to-hibernate then charge-to-100% cycles without interrupting the charge. After the third cycle the gauge should track smoothly; if it still jumps after that, confirm the cell is reaching 12.6V at full charge before troubleshooting further.
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