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Samsung NP900X3C Replacement Battery 7.4V 5850mAh AA-PBXN4AR

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From $115.99 USD $139.99
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Fits Samsung NP900X3C ultrabook; replaces OEM battery AA-PBXN4AR and AA-PLXN4AR.
7.4V, 5850mAh lithium-polymer delivers 43.29Wh to restore full charge cycles on this ultrabook.
Connector plugs into the internal battery slot with single locking tab; orientation keyed to prevent reverse insertion.
We bench-tested this cell on NP900X3C motherboard; BMS negotiated charge current correctly and voltage held steady under sustained CPU load.
After installation, run one full discharge to sleep cutoff, then charge uninterrupted to 100%—this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after every cell swap.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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.

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🔹 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: 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.

Voltage

7.4V

Amp

5850mAh

Samsung NP900X3C Series — 7.4V Li-Polymer Replacement Battery (AA-PBXN4AR)

This is a 7.4V, 5850mAh (43.29Wh) Li-Polymer replacement battery for the Samsung NP900X3C ultrabook. It fits the 900X3C-A01, 900X3C-A01AU, and over 188 confirmed model variants in the 900X3C lineup. The flat 6mm profile matches the original cell geometry inside the ultrabook chassis.

  • NP900X3C Series compatibility: Every model in this series runs the same 7.4V two-cell Li-Polymer architecture with the AA-PBXN4AR or AA-PLXN4AR part number. The BMS connector pinout and charge handshake are shared across all 900X3C variants, so one cell covers the full range.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the NP900X3C platform. The BMS handshake completed without error codes, charge termination triggered correctly at 8.4V, and the SMBus communication with the EC remained stable throughout.
  • First-cycle calibration on the NP900X3C: After installing, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to re-anchor against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after swapping the NP900X3C cell

The NP900X3C reads battery health from EEPROM data embedded in the original cell's fuel gauge IC. When a new cell goes in, that EEPROM registers as either blank or mismatched against the system's stored baseline. Samsung's firmware flags this as degraded health before any real capacity measurement has taken place. The fix is not a hardware fault — it is a learn cycle. Discharge fully to hibernate, charge to 100% without interruption, and the BIOS recalibrates its health metric against the new cell's actual data.

NP900X3C shutting down at 20–30% with no warning after battery replacement

The fuel gauge IC in the NP900X3C tracks remaining capacity using a coulomb counter that was calibrated to the old cell's discharge curve. After a swap, that curve no longer matches, so the gauge reads 25% while the cell voltage is already at the BMS cutoff threshold. The system shuts down because actual cell voltage collapsed — not because the gauge triggered low-battery shutdown. Run two to three full discharge-and-charge cycles to let the coulomb counter re-anchor. After calibration, the gauge should align with actual cutoff at or below 3.0V per cell.

Compatible Models

NP900X3C 900X3C 900X3C-A01 900X3C-A01AU NP900X3C-A01CN 900X3C-A04 900X3C-A04DE 900X3C-A02 900X3C-A02DE 900X3F-K01 NP900X3D-A01US ATIV Book 9 NP900X3F NP900X3F-K01HK NP900X3F-K01US NP900X3E NP900X3F-K01 NP900X3F-K01CN NP900X3F-EG1CN NP900X3F-K01ID NP900X3F-K01PH NP900X3F-K01BE NP900X3F-G01UK NP900X3F-K01GR NP900X3D NP900X3D-A01 NP900X3D-A05 NP900X3D-A05HK NP900X3D-A03US NP900X3E-A02US NP900X3D-A04US NP900X3D-A03PH NP900X3D-A01UK NP900X3D-A01CN NP900X3D-A05CN NP900X3D-A03CA NP900X3D-A05ES NP900X3D-A01ZA 900X3E-K01US ATIV BOOK 9 900X3F NP-900X3F ATIV BOOK 9 NP 900X3G NP-900X3G NP900X3B NP900X3B-A01 NP900X3B-A01CA NP900X3B-A01US NP900X3B-A02 NP900X3B-A02US NP900X3B-A03 NP900X3B-A03US NP900X3B-AD1 NP900X3C-A01 NP900X3C-A01AU NP900X3C-A01BE NP900X3C-A01CA NP900X3C-A01CH NP900X3C-A01FR NP900X3C-A01IT NP900X3C-A01MX NP900X3C-A01NL NP900X3C-A01PL NP900X3C-A01SE NP900X3C-A01US NP900X3C-A02 NP900X3C-A02AU NP900X3C-A02BE NP900X3C-A02CA NP900X3C-A02CH NP900X3C-A02DE NP900X3C-A02IT NP900X3C-A02MX NP900X3C-A02PL NP900X3C-A02UK NP900X3C-A02US NP900X3C-A03 NP900X3C-A03AU NP900X3C-A03CA NP900X3C-A03CH ULTRABOOK NP900X3C-A03DE NP900X3C-A03FR NP900X3C-A03PL NP900X3C-A03US NP900X3C-A04 NP900X3C-A04BE NP900X3C-A04DE NP900X3C-A04FR NP900X3C-A04PL NP900X3C-A04US NP900X3C-A05 NP900X3C-A05DE NP900X3C-A05FR NP900X3C-A05NL NP900X3C-A05US NP900X3C-A06 NP900X3C-A06AU NP900X3C-A06DE NP900X3C-A06NL NP900X3C-A07 NP900X3C-A07DE NP900X3C-A08 NP900X3C-A08DE NP900X3C-AB1 NP900X3C-AB1AU NP900X3C-AB2 NP900X3C-AB2AU NP900X3C-B01 NP900X3C-MS1 NP900X3C-MS1DE NP900X3D-A01AU NP900X3D-A01CH NP900X3D-A01DE NP900X3D-A01FR NP900X3D-A01IT NP900X3D-A01MX NP900X3D-A01PL NP900X3D-A02 NP900X3D-A02CH NP900X3D-A02DE NP900X3D-A02US NP900X3D-A03 NP900X3D-A03CH NP900X3D-A03DE NP900X3D-A03FR NP900X3D-A03IT NP900X3D-A03PL NP900X3D-A04 NP900X3D-A04CH NP900X3D-A04FR NP900X3D-A05FR NP900X3D-A05US NP900X3D-AD1 NP900X3D-BB1 NP900X3E-A01 NP900X3E-A01AU NP900X3E-A01CH NP900X3E-A01DE NP900X3E-A01FR NP900X3E-A01IT NP900X3E-A01MX NP900X3E-A01NL NP900X3E-A01PL NP900X3E-A01US NP900X3E-A02 NP900X3E-A02CA NP900X3E-A02CH NP900X3E-A02DE NP900X3E-A02FR NP900X3E-A02IT NP900X3E-A02MX NP900X3E-A02NL NP900X3E-A02PL NP900X3E-A03 NP900X3E-A03BE NP900X3E-A03DE NP900X3E-A03US NP900X3E-A04 NP900X3E-A04US NP900X3E-A05 NP900X3E-A05DE NP900X3E-A05US NP900X3E-A06 NP900X3E-A06DE NP900X3E-K01 NP900X3E-K01AU NP900X3E-K01CA NP900X3E-K01DE NP900X3E-K01US NP900X3E-K02 NP900X3E-K02DE NP900X3E-K03 NP900X3E-K03DE NP900X3E-K06 NP900X3E-K06DE NP900X3F-G01 NP900X3F-G01DE NP900X3F-K01AU NP900X3F-K01CA NP900X3F-K01DE NP900X3F-K02 NP900X3F-K03 NP900X3F-KD1 NP900X3G NP900X3G-K01 NP900X3G-K01CA NP900X3G-K02 NP900X3G-K02CA SERIES 9 NP-900X3B SERIES 9 NP-900X3C SERIES 9 NP-900X3D SERIES 9 NP-900X3E 900X3B-A74 NT900X3B-A74 NP900X3B-A74

Replaces Part Numbers

AA-PBXN4AR AA-PLXN4AR

Technical Specifications

Voltage7.4V
Amp Hours5850mAh
Capacity5850mAh
Rate43.29Wh
Net Weight218g /7.69 oz
Gross Weight478g /16.86 oz
Approximate Weight478g /16.86 oz
Dimension 283.70 x 103.00 x 6.00mm

Product Highlights

  • Brand: Samsung
  • 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

Why does my NP900X3C show 0% or "unknown battery" in Windows immediately after fitting the new cell?

The fuel gauge IC on the replacement cell has not yet completed its first SMBus handshake with the Samsung EC firmware. Windows pulls battery state data from that handshake, and before calibration it returns null or zero. Power the laptop on, let it sit on AC for ten minutes, then discharge to hibernate and recharge fully — the EC registers the new cell's data on the first completed cycle and the gauge populates correctly.

The Wh rating shown in Samsung Battery Manager does not match the 43.29Wh spec — is the cell wrong?

No. Samsung Battery Manager reads the rated Wh value stored in the cell's EEPROM at manufacture, which can differ from actual measured capacity by several watt-hours depending on the chemistry batch. The EEPROM figure is a nominal label, not a live measurement. After one full calibration cycle, the reported Design Capacity will reflect what the EC has actually measured from the new cell and the discrepancy narrows significantly.

Charge stopped at 80% on the NP900X3C and will not go higher — is the replacement cell faulty?

Almost certainly not. The NP900X3C BIOS includes a battery lifespan mode that caps charge at 80% when the setting is active. Check Samsung Settings or Samsung Battery Manager under the "Battery Life Extender" or "Maximum Battery Life" option and disable it. Once turned off, initiate a fresh charge cycle — the cell should charge to the full 8.4V termination voltage without issue.

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