Samsung ATIV Book 9 Spin AA-PBUN4AR Compatible Battery 7.7V
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Samsung ATIV Book 9 Spin AA-PBUN4AR Compatible Battery 7.7V - 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.
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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.
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Samsung ATIV Book 9 Spin AA-PBUN4AR Compatible Battery 7.7V - is backordered and will ship as soon as it is back in stock.
Voltage
7.7V
Amp
5100mAh
Samsung ATIV Book 9 Spin 900X5L Series — 7.7V Li-Polymer Replacement Battery (AA-PBUN4AR)
This 7.7V, 5100mAh (39.27Wh) lithium-polymer cell replaces the OEM battery in the Samsung ATIV Book 9 Spin and 900X5L series convertible laptops. It fits models including the 900X5L-K01 and 900X5L-K02, along with 249 additional variants sharing the same AA-PBUN4AR specification. The slim 5.10mm profile matches the original pack geometry for the 2-in-1 chassis.
- 900X5L platform compatibility: The 900X5L series uses a shared 7.7V power rail and a proprietary connector that keys to the AA-PBUN4AR pack. Every model in this lineup communicates with the BIOS through the same BMS handshake protocol, so one cell covers the entire family without modification.
- Bench tested on actual hardware: We ran this cell on a 900X5L unit and monitored BMS communication through full charge and discharge cycles. The protection circuit responded correctly to cell voltage boundaries at both ends, and the BIOS accepted the battery without throwing an unknown-device flag.
- Post-install discharge cycle on the ATIV Book 9 Spin: After fitting this battery, run one full discharge down to the automatic hibernate cutoff, then charge uninterrupted to 100% before using the device normally. The BIOS battery learn cycle resets against the new cell's actual capacity — skipping this step causes the fuel gauge to read incorrectly for the first week of use.
BIOS reporting poor battery health immediately after installation
The ATIV Book 9 Spin's BIOS stores charge history and health data in the old cell's EEPROM. When a new cell goes in, the BIOS compares the blank EEPROM against the accumulated wear data it expects and flags the result as degraded. This is a data mismatch, not a cell fault. Running the battery learn cycle — one full discharge to hibernate cutoff followed by an uninterrupted charge to 100% — gives the BIOS enough real data to recalculate health from zero. After two to three full cycles, the health indicator stabilises at its correct value.
Laptop shuts down at 20–30% charge shown on the gauge
This happens when the fuel gauge IC hasn't yet mapped the new cell's actual voltage curve. The gauge reports 25% remaining while the cell voltage has already dropped below the load threshold the system needs to sustain the CPU and display together. The BMS trips the cutoff before the OS can gracefully shut down. Run two to three calibration cycles — full discharge to hibernate cutoff, then full charge to 100% each time — until the shutdown point drops to single-digit percentages or the cell reaches the 3.0V per cell floor at the correct gauge reading.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 Windows show the battery capacity as much lower than 39Wh right after installation?
The fuel gauge IC on the 900X5L reads stored EEPROM data from the old cell and applies that wear history to the new one. Until the IC runs calibration cycles against the fresh cell's actual charge curve, the reported Wh figure stays anchored to the degraded old pack's numbers. Run two full discharge-to-hibernate-cutoff and recharge-to-100% cycles without interruption. After the second cycle, the reported Wh value re-anchors to the new cell's real capacity.
The new battery stopped charging at 80% and won't go higher — is the cell faulty?
It's almost certainly not the cell. Samsung's BIOS on the 900X5L series includes a charge-limit feature that caps charging at 80% to reduce long-term cell stress when the laptop sits plugged in regularly. Check Samsung Settings or Samsung Battery Manager in Windows — the "Battery Life Extender" or "Maximum Battery Life" mode cuts the charge ceiling to exactly 80%. Toggle that setting off and the battery will charge to 100% on the next cycle.
After swapping the battery, the gauge jumps erratically — 60%, then 45%, then back to 55% within minutes. What causes that?
The fuel gauge IC on this platform uses voltage-to-capacity lookup tables calibrated to the original cell's chemistry signature. A new cell has a slightly different open-circuit voltage curve until it's been cycled, so the IC interpolates incorrectly and produces unstable readings. This is not a wiring or connector fault. Run three uninterrupted full discharge-to-100% charge cycles, and the IC recalibrates its lookup table against the new cell — erratic jumps stop once the voltage curve is mapped correctly.
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