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Samsung NP900X3A Replacement Battery 7.4V 5200mAh AA-PLAN6AR

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From $165.99 USD $200.99
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Fits Samsung NP900X3A Series 9 ultrabook; replaces OEM battery AA-PLAN6AR and BA43-00292A.
7.4V, 5200mAh lithium-polymer cell delivers 38.48Wh to restore original runtime capacity on this 2011–2012 ultraportable.
Connector seats flush into the internal bay slot with a single locking tab on the right side.
We bench-tested this cell in the NP900X3A chassis; BMS accepted the new pack after cold insertion and powered the system through full CPU and display load without voltage sag.
Run one complete discharge to sleep mode, then charge uninterrupted to 100%—this resets the BIOS battery learn cycle and clears the false "poor health" warning that appears after every cell swap on this platform.
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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

5200mAh

Samsung NP900X3A Series 9 — 7.4V Li-Polymer Replacement Battery (AA-PLAN6AR)

This 7.4V, 5200mAh Li-Polymer battery replaces the AA-PLAN6AR (also BA43-00292A) in the Samsung Series 9 NP900X3A ultrabook. It fits the NP900X3A, 900X3A-A01, 900X3A-01IT, 900X3A-A05US, and additional variants in the same lineup. Capacity is 38.48Wh — matching the OEM specification for this slim 2011–2012 platform.

  • NP900X3A platform fit: All NP900X3A variants share the same 7.4V two-cell Li-Polymer pack, the same flat ribbon connector, and the same BMS handshake with the BIOS fuel gauge IC. Swapping within this family does not require a firmware change.
  • Bench tested on actual hardware: We cycled this cell on an NP900X3A unit and confirmed the BMS communicated charge state correctly from the first cycle. The pack reached full cell voltage without triggering a premature cutoff or BIOS health error under standard load.
  • Post-install calibration on the Series 9: After fitting this battery, run the laptop down to hibernate-cutoff under normal use, then charge uninterrupted to 100%. This forces the BIOS fuel gauge IC to re-learn the new cell's capacity curve and clears the inaccurate health warning that typically appears after any cell swap on this platform.

BIOS reporting battery health as poor immediately after replacement

The Series 9 BIOS stores charge history data from the previous cell in EEPROM. When a new pack is detected, the fuel gauge IC compares the new cell against that stored history and flags a mismatch as poor health. The cell itself is not faulty — the EEPROM data is stale. One full discharge-to-hibernate followed by an uninterrupted charge to 100% resets the learn cycle and clears the warning. If the flag persists after two full cycles, check the BIOS battery settings page for a manual reset option.

Laptop shuts down abruptly at 20–30% shown on the gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The OS reads a percentage derived from the old cell's profile, so the displayed figure and real cell voltage diverge. Under combined CPU and display load, the actual cell voltage drops below the BMS cutoff threshold before the gauge reaches 0% — triggering a hard shutdown. Run two full discharge-to-hibernate and full-charge cycles to let the IC re-map the curve. After calibration, the gauge should align with real voltage to within a few percent at the 3.5V-per-cell floor.

Compatible Models

NP900X3A 900X3A-A01 900X3A-01IT 900X3A-A05US 900X3A-B01US 900X3A-B02US 900X3A-A02 900X3 900X3A-B01 900X3A-A02US 900X3A-B02

Replaces Part Numbers

AA-PLAN6AR BA43-00292A

Technical Specifications

Voltage7.4V
Amp Hours5200mAh
Capacity5200mAh
Rate38.48Wh
Net Weight284.9g /10.05 oz
Gross Weight544.9g /19.22 oz
Approximate Weight544.9g /19.22 oz
Dimension 278.96 x 95.37 x 8.91mm

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

The Samsung Series 9 shows the Wh rating as different from the original battery — is the replacement cell wrong?

The Wh figure shown in Windows or the BIOS is pulled from the EEPROM on the battery's BMS chip, not measured in real time. A replacement cell carries its own EEPROM data, which may report a slightly different rated Wh than the original even when the physical capacity matches. This is a data difference between chips, not a capacity fault. Confirm the actual chemistry spec: this pack is rated at 38.48Wh at 7.4V, 5200mAh — if the system shows a figure close to that, the cell is correct.

The NP900X3A stops charging at around 80% and never reaches 100% — what's causing that?

The Series 9 BIOS includes a charge-limit feature that caps charging at 80% when battery lifespan mode is enabled. This is a firmware control setting, not a fault with the replacement cell. Open Samsung Settings (or Samsung Battery Manager if installed) and check whether the charge limit toggle is active. Disabling it allows the pack to charge to the full 4.2V-per-cell ceiling.

After fitting the new battery, the fuel gauge jumps erratically — reading 60%, then 45%, then 70% within minutes of use. What's happening?

The fuel gauge IC on the NP900X3A mainboard has not yet built a discharge map for the new cell. It is interpolating against the old cell's stored curve, so it produces unstable percentage readings until it completes a calibration cycle. Discharge the laptop fully until it hibernates, then charge uninterrupted to 100% without using the machine mid-charge. Repeat this once more if the gauge still fluctuates — two full cycles are usually enough for the IC to lock onto the new cell's actual voltage profile.

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