Sony VAIO VGN-AX570G 11.1V Replacement Battery VGP-BPL4
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Sony VAIO VGN-AX570G 11.1V Replacement Battery VGP-BPL4 - 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-AX570G 11.1V Replacement Battery VGP-BPL4 - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
8800mAh
Sony VAIO VGN-AX570G / VGN-BX Series — 11.1V Li-ion Replacement Battery (VGP-BPL4)
This 11.1V 8800mAh (97.68Wh) Li-ion battery replaces the VGP-BPL4, VGP-BPL4A, VGP-BPS4, and VGP-BPS4A across Sony VAIO VGN-AX and VGN-BX series laptops. It fits the VGN-AX570G, VGN-AX580G, VGN-BX143C, VGN-BX143CP, and over 50 additional VAIO models sharing this battery bay and connector. Capacity is 8800mAh — matched to the original specification.
- VGN-AX and VGN-BX platform fit: Sony used the same 11.1V battery rail, physical bay dimensions, and SMBus connector pinout across the VGN-AX and VGN-BX lines. Any model listing VGP-BPL4 or VGP-BPS4 as its OEM part number draws from the same electrical specification, so one cell covers the full range without adapter or modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on VAIO hardware. The BMS communicated state-of-charge correctly over SMBus, accepted charge from the OEM AC adapter without triggering a fault, and held voltage within spec at the discharge knee.
- First-cycle calibration on VAIO BX and AX laptops: After installing, run the laptop on battery until it reaches hibernate cutoff — do not plug in mid-cycle. Then charge uninterrupted to 100%. This gives the fuel gauge IC a full reference curve against the new cell and clears the inaccurate health warning BIOS displays after every cell swap.
BIOS reporting battery health as "poor" immediately after installation
Sony VAIO BIOS reads health status from EEPROM data stored in the battery's BMS — not from live cell measurements. When a new cell arrives, its EEPROM cycle count and rated capacity may not match what the BIOS expects from the previous battery's learned data. The system flags this mismatch as "replace battery" or "poor health" even though the cell is new. Running one full discharge-to-hibernate then a complete uninterrupted charge resets the learn cycle and brings the BIOS health indicator back to normal.
Laptop shuts down abruptly with 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 gauge loses accuracy at the low end, and the laptop hits the hardware undervoltage cutoff before the OS reaches 0%. Under combined CPU and display load, voltage drops faster than the uncalibrated gauge predicts. Run two full discharge-to-hibernate cycles with an uninterrupted charge to 100% between each — after that, the cutoff should align with the gauge reading at or below 5%.
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 Sony VAIO shows the new battery as "unknown" or 0% in Windows right after fitting it — what's wrong?
The fuel gauge IC in the replacement cell has no calibration data yet for this specific laptop's charge profile, so Windows reads the SMBus output as indeterminate. Nothing is faulty. Run the laptop on battery until it hibernates from low charge, then charge it uninterrupted to 100% without using the laptop. Do that cycle twice and the Windows gauge will lock onto accurate readings.
The VAIO BIOS shows a completely different Wh rating than the 97.68Wh spec on the listing — is the battery mislabelled?
The Wh figure BIOS displays comes from the EEPROM programmed into the battery's BMS chip, which stores the cell manufacturer's rated chemistry value — this can differ slightly from the measured capacity we list, which is based on actual bench discharge. The electrical capacity is correct at 8800mAh and 11.1V. If the BIOS figure concerns you, check it again after two full calibration cycles — the reported value can shift as the BMS updates its learned data.
The replacement battery stopped charging at 80% and won't go higher — is the cell defective?
This is almost always a BIOS-controlled charge limit, not a cell fault. Sony VAIO firmware on some AX and BX models activates a charge ceiling when it detects battery stress flags in the BMS EEPROM — flags that carry over from a degraded original cell. Go to VAIO Control Center, find the Battery Care Function setting, and set it to "Full Charge Mode." If that option is greyed out, a BIOS update from Sony's support site for your specific model number may clear the restriction.
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