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Samsung 900X4B-A02 Replacement Battery 7.4V 8400mAh

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From $146.99 USD $177.99
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Fits Samsung 900X4B-A02 ultrabook; replaces OEM part number AA-PBXN8AR.
7.4V, 8400mAh lithium-polymer delivers 62.16Wh — sustains CPU and display load without mid-cycle shutdowns.
Connector seats flat into the battery slot with a single locking tab on the left edge.
We ran full discharge cycles on a 900X4B-A02 — BMS voltage curve held steady through 80% capacity, no early cutoff.
After installation, run one full discharge to hibernation 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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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.

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: 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

8400mAh

Samsung 900X4B / 900X4C Series — 7.4V Li-Polymer Replacement Battery (AA-PBXN8AR)

This is a 7.4V, 8400mAh (62.16Wh) lithium-polymer replacement for the Samsung Series 9 ultrabook battery AA-PBXN8AR. It fits the 900X4B-A02, 900X4B-A02US, 900X4B-A03, 900X4C-A04DE, and over 67 additional Series 9 variants. The slim 6.80mm profile matches the original cell geometry for a flush fit inside the chassis.

  • Series 9 ultrabook compatibility: All listed 900X4B and 900X4C models share the same 7.4V two-cell Li-Polymer architecture, the AA-PBXN8AR connector pinout, and the same BMS handshake protocol — which is why one cell covers the full variant range.
  • Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a 900X4B chassis. The BMS negotiated correctly, the fuel gauge IC registered the full 62.16Wh capacity, and charge termination triggered cleanly at cutoff voltage.
  • Post-install calibration on Series 9: After fitting this cell, run one full discharge until the laptop hibernates at low-battery cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the first boot after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The Series 9 BIOS stores cycle count and health data in the outgoing cell's EEPROM. When a new cell arrives with a fresh EEPROM, the BIOS reads the data mismatch and flags the battery as unknown or degraded — even though the cell is new. This is not a fault with the replacement. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% completes the BIOS learn cycle and updates the health register. After two to three full cycles, the reported health figure normalises.

Laptop shutting down abruptly at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The percentage shown on screen is derived from the old cell's curve, so the displayed value and the real state of charge drift apart — the laptop cuts out before the gauge reaches zero. The fix is two to three full discharge-to-hibernate and full-charge cycles, which lets the fuel gauge IC re-map the new cell's voltage profile. After calibration, the percentage reading tracks the real charge state and the early shutdowns stop.

Compatible Models

900X4B-A02 900X4B-A02US 900X4B-A03 900X4C-A04DE 900X4 NP900X4 900X4B-A01DE 900X4C-A01 NP900X4C-A01CN 900X4D-A01 900X4B-A01FR 900X46 900X4D-A02 900X4D-A03 900X4 Series 900X4C-A02 900X4C-A03 900X4C-K01 900X4D-K01 900X4D-K02 NP900X4 Series NP900X4B NP900X4B-A01DE NP900X4B-A02CN NP900X4B-A02DE NP900X4B-A02US NP900X4C NP900X4C-A01CA NP900X4C-A01CH NP900X4C-A01DE NP900X4C-A01IT NP900X4C-A01PT NP900X4C-A01SG NP900X4C-A01US NP900X4C-A02CH NP900X4C-A02CN NP900X4C-A02DE NP900X4C-A02GR NP900X4C-A02SG NP900X4C-A03CA NP900X4C-A03CN NP900X4C-A03DE NP900X4C-A04DE NP900X4C-A04US NP900X4C-A05AU NP900X4C-A05DE NP900X4C-A06DE NP900X4C-A06US NP900X4C-A07 NP900X4C-A07DE NP900X4C-A07US NP900X4C-A08DE NP900X4C-A0ADE NP900X4C-A10TW NP900X4C-E01HK NP900X4D NP900X4D- A02AU NP900X4D-A01CH NP900X4D-A01CN NP900X4D-A01DE NP900X4D-A01ES NP900X4D-A02CN NP900X4D-A02DE NP900X4D-A02NL NP900X4D-A03CA NP900X4D-A03CN NP900X4D-A03DE NP900X4D-K01CN NP900X4D-K01DE NP900X4D-K02CN NP900X4D-K03SE

Replaces Part Numbers

AA-PBXN8AR

Technical Specifications

Voltage7.4V
Amp Hours8400mAh
Capacity8400mAh
Rate62.16Wh
Net Weight310g /10.93 oz
Gross Weight570g /20.11 oz
Approximate Weight570g /20.11 oz
Dimension 329.00 x 140.80 x 6.80mm

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

Samsung BIOS says "Replace Battery" on first boot after installing the new AA-PBXN8AR — is the cell faulty?

No. The Series 9 BIOS reads health data from the outgoing cell's EEPROM and flags a mismatch when a new cell with a blank EEPROM is fitted. Discharge fully to hibernate cutoff, then charge uninterrupted to 100%. That single learn cycle clears the warning on most 900X4B units.

The battery percentage jumps around wildly — showing 60%, then 35%, then 55% within minutes of unplugging. What causes this?

The fuel gauge IC is still mapped to the old cell's voltage discharge curve. It takes two to three full discharge-to-hibernate and uninterrupted full-charge cycles before the IC re-calibrates against the new cell's actual chemistry. Do not rely on the percentage reading during those first cycles — let the laptop hibernate on its own rather than manually shutting down at a set percentage.

System info shows this battery as 57Wh but the cell should be 62.16Wh — why is there a discrepancy?

The Wh figure shown in Windows or Samsung's battery info panel is pulled from the EEPROM rated value stored on the cell, which may differ slightly from the actual measured capacity. After the BIOS learn cycle completes — one full discharge to hibernate, one full charge to 100% — the reported Wh figure updates to reflect the calibrated cell data. If it still reads low after three full cycles, check that the BIOS is not running a capped-charge firmware setting.

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