Asus P2520LJ Replacement Battery 14.4V 2400mAh A41N1421
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Asus P2520LJ Replacement Battery 14.4V 2400mAh A41N1421 - 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
⚠️ 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 P2520LJ Replacement Battery 14.4V 2400mAh A41N1421 - is backordered and will ship as soon as it is back in stock.
Voltage
14.4V
Amp
2400mAh
Asus P2520LJ / PU551LA Series — 14.4V Li-ion Replacement Battery (A41N1421)
This 14.4V Li-ion battery replaces the original cell in the Asus P2520LJ, PU551LA, P2520SA, and ZX50JX4200, along with several hundred compatible variants sharing the same connector and BMS handshake. Capacity is 2400mAh (34.56Wh), matching the stock specification. It covers the A41N1421 OEM part number and cross-references including 0B110-00320100, 0B110-00280000, and related variants.
- P2520 and PU551 platform fit: These models share a four-cell Li-ion architecture on the same 14.4V rail with an identical locking connector and BMS communication protocol — which is why one cell works across all of them without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the P2520LJ platform. The BMS handshook correctly with the Asus EC, reported accurate state-of-charge to the OS, and thermal cutoffs triggered at expected thresholds during load testing.
- Post-install calibration on P2520 series: After fitting this cell, run the laptop down to automatic hibernate cutoff — do not manually shut down — then charge uninterrupted to 100% without use. This resets the BIOS battery learn cycle and clears the false "poor health" warning that appears after any cell swap on this platform.
Why the P2520LJ BIOS reports poor battery health on a new cell
The Asus EC reads health data from EEPROM registers populated by the previous cell's charge history. When a new cell goes in, those registers still hold the old degraded-cell values, so the BIOS flags the new battery as worn before it has run a single cycle. This is firmware behaviour, not a fault with the replacement. Running one full discharge-to-hibernate then an uninterrupted charge to 100% forces the EC to rewrite the learn cycle data against the new cell. After one or two cycles, the health indicator normalises.
Laptop shuts off at 20–30% remaining after the battery swap
The fuel gauge IC calibrates its empty-point estimate against the previous cell's internal resistance profile. With a new cell installed, the IC underestimates remaining capacity and triggers a low-voltage shutdown too early — typically between 20% and 30% displayed charge. The cell voltage at that point is still well above the actual cutoff floor. Perform two full discharge-to-hibernate cycles followed by full uninterrupted charges; the fuel gauge IC recalibrates its curve against the new cell's chemistry, and the shutdown threshold returns to near 0%. After the second cycle, the displayed percentage at shutdown should be below 5%.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Asus
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The Asus battery health screen shows "poor" or "replace" on a brand-new cell — is something wrong with the replacement?
Nothing is wrong with the cell. The Asus EC reads health status from EEPROM data written by the previous battery, and that data persists after a swap. Run the laptop down to automatic hibernate cutoff — not a manual shutdown — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to rewrite against the new cell, and the health warning clears within one to two cycles.
System info shows the wrong Wh rating — it says 32Wh or 48Wh instead of 34.56Wh. Is the battery mislabelled?
The Wh figure shown in Windows or the Asus battery panel is read from the cell's EEPROM, which stores the rated design capacity from the OEM firmware — not the measured capacity of the physical chemistry. Differences of a few watt-hours between displayed and actual are normal across replacement cells. The cell itself is 34.56Wh; the discrepancy is a firmware reporting artefact, not a capacity defect. No action is needed — the cell charges and discharges to its full rated capacity regardless of what the EEPROM figure displays.
The P2520LJ fuel gauge jumps around wildly — 60% one minute, 35% the next — after fitting the new battery.
The fuel gauge IC builds its state-of-charge model from the internal resistance and voltage curve of the previous cell. A new cell has a different curve, so the IC's estimates are inaccurate until it has enough cycle data to recalibrate. Run two complete discharge-to-hibernate cycles with full uninterrupted charges between them. By the end of the second cycle the gauge IC has enough data points to track the new cell accurately, and the readings stabilise.
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