Sony VAIO VGN-AW41JF Compatible Battery 11.1V 4400mAh VGP-BPS21
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Sony VAIO VGN-AW41JF Compatible Battery 11.1V 4400mAh VGP-BPS21 - 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.
Sony VAIO VGN-AW41JF Compatible Battery 11.1V 4400mAh VGP-BPS21 - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
Sony VAIO VGN-AW41JF Series — 11.1V Li-ion Replacement Battery (VGP-BPS21)
This is an 11.1V, 4400mAh (48.84Wh) lithium-ion battery for the Sony VAIO VGN-AW41JF and related AW-series notebooks. It replaces OEM part numbers VGP-BPS21, VGP-BPS21A, VGP-BPS21B, and VGP-BP21A. The battery restores cordless operation on systems where the original cell no longer holds a usable charge.
- AW-series compatibility: The VGN-AW41JF, AW41MF, AW41XH, AW41ZF, and hundreds of related AW-series models share the same 11.1V three-cell rail, connector pinout, and BMS handshake protocol. Any unit accepting VGP-BPS21, VGP-BPS21A, or VGP-BPS21B will accept this cell.
- Bench tested on actual hardware: We ran this battery on a VGN-AW series unit and confirmed the BMS completed handshake on first boot, VAIO Control Center registered the cell, and the charge circuit accepted a full charge cycle without interruption.
- First-cycle discharge procedure: After fitting this cell, run the laptop on battery until it hibernates at cutoff — do not interrupt. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health or "replace battery" warning that appears after most cell swaps on VAIO hardware.
BIOS reporting poor battery health immediately after fitting a new cell
Sony VAIO notebooks store charge history and health data in EEPROM on the battery itself. When a new cell arrives, the BIOS reads that EEPROM data — which is blank or pre-set — and flags the battery as degraded or unknown. This is a firmware interpretation issue, not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by an uninterrupted charge to 100% gives the BIOS the data it needs to re-evaluate health status accurately. After two to three cycles, the health indicator should resolve to normal.
Laptop shuts off abruptly at 20–30% charge shown on the gauge
This happens when the fuel gauge IC is still calibrated to the old, degraded cell's discharge curve. The gauge reports 20–30% remaining, but the new cell's actual voltage under combined CPU and display load drops past the BMS cutoff threshold before the percentage reaches zero. The system shuts down because the BMS is protecting the cell, not because the gauge is correct. Run two full discharge-to-hibernate and charge-to-100% cycles — by the second cycle, the fuel gauge IC recalibrates to the new cell's curve and cutoffs align with the displayed percentage.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Sony
- 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
My VAIO shows the new battery as "0% available (plugged in, charging)" and never updates — what's happening?
The fuel gauge IC lost its reference point when the old cell was removed and hasn't built a charge map for the new cell yet. This blank or frozen reading is normal for the first partial cycle on VAIO hardware. Run the battery down to hibernate cutoff, then charge uninterrupted to 100% — after that full cycle the gauge IC has enough data to report accurately, and the percentage will update correctly on subsequent use.
System info shows the wrong Wh rating — 42Wh instead of 48.84Wh — after I fitted this battery. Is the cell underspec?
The Wh figure displayed in Windows or VAIO Control Center is pulled from the battery's EEPROM, which stores a rated value written at the factory. Some replacement cells ship with a conservative rated-Wh value in EEPROM that doesn't match the actual chemistry capacity of 48.84Wh. The cell itself is not underspec — actual delivered capacity matches the rated 4400mAh at 11.1V. To confirm, check the charge cycle count and full-charge capacity in HWiNFO or BatteryInfoView after two complete calibration cycles; the reported design capacity should update closer to the actual figure.
The charging indicator light goes solid and stops at 80% — the laptop won't charge past that point no matter how long it's left plugged in.
Sony VAIO firmware on some AW-series models includes a battery care charge limit that caps charging at 80% to reduce cell stress during long AC-connected use. This is a BIOS-controlled setting, not a fault with the replacement cell. Open VAIO Control Center, navigate to Power Management, and check whether "Battery Care Function" is enabled — disabling it allows the system to charge to 100%. If VAIO Control Center is not installed, reinstalling it from Sony's support site restores access to that setting.
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