Asus VivoBook 15 E1504FA Replacement Battery 11.55V 3600mAh
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Asus VivoBook 15 E1504FA Replacement Battery 11.55V 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.
Disclaimer
Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Asus VivoBook 15 E1504FA Replacement Battery 11.55V 3600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.55V
Amp
3600mAh
Asus E1504FA Series — 11.55V Li-Polymer Replacement Battery (0B200-04260000)
This 11.55V, 3600mAh (41.58Wh) Li-Polymer battery replaces the original cell in the Asus VivoBook 15 E1504FA series, including the BQ038W, BQ090, BQ204W, BQ372W, and over 260 additional variants. It matches OEM part numbers 0B200-04260000 and C31N2201. The connector, BMS handshake protocol, and physical dimensions are a direct match for the E1504FA platform.
- E1504FA platform compatibility: All E1504FA variants share the same 11.55V three-cell configuration, connector pinout, and BMS communication line. That common architecture means one cell fits the full production run without adapter modifications or firmware workarounds.
- Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS handshake verification on E1504FA hardware. The BMS negotiated correctly, charge current stepped down at the expected threshold, and no fault codes were triggered during the cycle.
- BIOS learn cycle after install: After fitting this cell, run the laptop down to hibernate-level cutoff on battery power, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after any cell swap on the E1504FA platform.
BIOS reporting battery health as poor immediately after replacement
The E1504FA stores capacity and cycle-count data in the EEPROM of the battery's fuel gauge IC. When a new cell is installed, the BIOS reads stale EEPROM values that do not match the fresh chemistry, and flags the battery as degraded. This is a data mismatch, not a cell fault. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% allows the fuel gauge IC to write fresh calibration data. After two to three cycles, the health status normalises in both BIOS and Windows battery report.
VivoBook 15 shutting down at 20–30% charge shown
This symptom appears when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The displayed percentage no longer matches the real cell voltage, so the laptop hits the low-voltage cutoff while the gauge still reads 20–30%. The fix is the same learn cycle: discharge fully to hibernate, then charge to 100% without interruption. After the calibration cycle, the shutdown threshold should align with the gauge reading at or below 5% remaining — approximately 10.5V at the cell terminals under light load.
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 VivoBook 15 still shows "plugged in, not charging" after fitting this new battery — what's happening?
The E1504FA BIOS includes a charge-limit setting that can be enabled in MyASUS, capping charging at 80% to reduce cell wear. If a previous owner or Windows update enabled it, the laptop will stop charging at 80% regardless of which cell is installed — it is a firmware setting, not a battery fault. Open MyASUS, go to Battery Health Charging, and switch the mode to Maximum Lifespan or Full Capacity. The cell will then charge to 100%.
Windows is reporting the wrong Wh rating for this battery — it shows a different number than 41.58Wh. Is the cell faulty?
The Wh figure Windows displays is read from the EEPROM on the fuel gauge IC, which stores the rated design capacity from the factory. Until the fuel gauge IC has run at least one full calibration cycle on the new cell, the reported value can differ from the actual 41.58Wh spec. Run a full discharge to hibernate, then charge uninterrupted to 100%. After one to two cycles, the fuel gauge IC recalculates full-charge capacity against real measured data and the reported Wh figure corrects itself.
The battery percentage jumps around wildly — it reads 60%, then drops to 30% seconds later. Why?
The fuel gauge IC on a freshly installed cell has no discharge-curve history for the new chemistry, so its state-of-charge estimates are poorly anchored. The gauge interpolates from EEPROM reference data that no longer matches the actual cell, producing large sudden jumps in reported percentage. Two to three full discharge-and-charge cycles give the IC enough real voltage-versus-capacity data points to stabilise the curve. After calibration, charge-level readings should track within a few percent of actual cell state across the full 11.55V–10.5V working range.
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