Sony VAIO VGN-AX570G Replacement Battery VGP-BPS4 11.1V
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Sony VAIO VGN-AX570G Replacement Battery VGP-BPS4 11.1V - 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.
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Sony VAIO VGN-AX570G Replacement Battery VGP-BPS4 11.1V - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
Sony VAIO VGN-AX570G Series — 11.1V Li-ion Replacement Battery (VGP-BPS4)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion battery built to the VGP-BPS4 / VGP-BPS4A specification. It fits Sony VAIO VGN-AX and VGN-BX series laptops, including the VGN-AX570G, VGN-AX580G, VGN-BX143C, and VGN-BX143CP, among others. It slots into the original bay and connects to the existing charge circuit without modification.
- VGN-AX and VGN-BX platform fit: Sony used the same 11.1V three-cell rail, identical connector pinout, and shared BMS handshake protocol across the AX and BX chassis lines. That common electrical spec is why a single OEM part number — VGP-BPS4 — covers both series.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a VGN-BX unit. The BMS negotiated correctly, charge current tapered at capacity without tripping an overcharge fault, and the protection circuit responded to a simulated short without latching off permanently.
- VAIO battery learn cycle after install: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100% before using the laptop on AC again. Sony's BIOS battery learn cycle reads EEPROM data from the new cell during this first full pass — skipping it often leaves the fuel gauge stuck at an incorrect percentage or triggers a false health warning.
BIOS reporting poor battery health immediately after fitting a new cell
Sony's BIOS reads stored health data from the battery's EEPROM at boot. A brand-new cell carries factory EEPROM values that don't match the charge history the BIOS expects, so it flags the battery as degraded before a single cycle has run. This is a data mismatch, not a fault with the cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — the BIOS recalibrates against the new EEPROM baseline and clears the warning on next boot.
Laptop shuts down abruptly at 20–30% charge shown on screen
This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load, even though the OS fuel gauge still shows charge remaining. The fuel gauge IC is calculating from an outdated capacity model tied to the old cell. The displayed percentage and the actual cell voltage are no longer tracking together. Complete two full calibration cycles — discharge to hibernate cutoff, charge to 100% each time — and the fuel gauge IC will re-anchor its model to the new cell's actual voltage curve.
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
The VAIO shows the correct percentage on screen but powers off without warning — why does that happen with a new battery?
The fuel gauge IC on these VAIO boards builds its charge model against the old cell's voltage curve. When you swap cells, the IC keeps using stale calibration data, so the displayed percentage and actual cell voltage diverge — the cell hits BMS cutoff while the screen still shows 25% or more. This isn't a fault in the replacement cell. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%, and the fuel gauge IC will recalibrate its model against the new cell.
Windows is reporting the battery's Wh capacity as lower than the rated 48.84Wh — is the cell underspec?
Windows reads the Wh figure directly from the battery's EEPROM, and a new cell ships with factory EEPROM data that doesn't yet reflect a charge history on your specific board. The rated chemistry capacity and the EEPROM-reported figure will often differ by several Wh until the cell goes through calibration cycles. Run one full discharge to hibernate cutoff, charge uninterrupted to 100%, and check System Information again — the reported Wh value will converge toward the rated 48.84Wh as the EEPROM updates.
After the first charge the battery stopped at around 80% and the indicator light went solid — is the cell defective?
Sony VAIO BIOS firmware on several AX and BX models includes a charge limit setting that caps charging at 80% to reduce cell wear. This is a BIOS-controlled function, not a battery fault. Enter the BIOS setup utility (F2 at the Sony splash screen), navigate to the Power Management section, and check whether "Battery Care Function" or a charge limit option is enabled — disabling it allows the cell to charge to 100%.
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