Sony VAIO VGN-U50 Replacement Battery VGP-BPS1 11.1V 4200mAh
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Sony VAIO VGN-U50 Replacement Battery VGP-BPS1 11.1V 4200mAh - 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-U50 Replacement Battery VGP-BPS1 11.1V 4200mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4200mAh
Sony VAIO VGN-U50 / VGN-U70 Series — 11.1V Li-ion Replacement Battery (VGP-BPS1)
This 11.1V, 4200mAh Li-ion battery replaces the VGP-BPS1 and VGP-BPL1 cells in the Sony VAIO U-series ultra-portable laptops. It fits the VGN-U50, VGN-U70, VGN-U8G, VGN-U8C, and related U-series models. Capacity is 46.62Wh — matched to the original Sony specification.
- VAIO U-series compatibility: The VGN-U50, VGN-U70, VGN-U8G, and VGN-U8C all share the same 11.1V three-cell battery bay, connector pinout, and BMS handshake protocol — which is why one cell fits the full U-series lineup without modification.
- Bench tested on actual hardware: We cycled this cell on a VGN-U series unit and confirmed the BMS negotiated correctly, charge termination triggered at full capacity, and discharge protection cut in at the expected low-voltage threshold without premature shutdown.
- First-cycle calibration on VAIO U-series: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the VAIO VGN-U50 shuts down at 20–30% after a battery swap
The VGN-U50 uses a fuel gauge IC that retains learned voltage-curve data from the previous cell. When a new cell is installed, the old curve causes the gauge to misread remaining capacity — the laptop thinks 20% is the floor and initiates shutdown even though charge remains. The fix is a full discharge-to-hibernate followed by an uninterrupted charge to 100%. After two or three full cycles, the fuel gauge IC recalibrates against the new cell's voltage profile and the cutoff point corrects itself.
BIOS reports battery health as "poor" or capacity as 0% immediately after install
This happens because the BIOS reads health data from EEPROM fields written by the original cell — the new cell's EEPROM starts without a charge history, so the BIOS flags it as degraded. It is not a fault with the replacement cell. Run one full discharge-to-hibernate, then charge uninterrupted to 100% to initialize the learn cycle. After the first complete cycle, the BIOS health readout on the VGN-U series typically updates to reflect accurate capacity above 90%.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Sony
- Manufacturer: CS
- Series: Standard
- Color: Metallic silver
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My VGN-U50 shows the new battery Wh rating as much lower than the sticker — is the cell undersized?
The figure shown in Sony's battery info screen pulls from the EEPROM "design capacity" field, which the new cell writes based on its rated chemistry baseline rather than the physical label on the pack. The 46.62Wh spec is correct for this cell. Run one full discharge-to-hibernate and a complete recharge — after that cycle the reported Wh value typically aligns with the rated capacity.
The fuel gauge on my VGN-U70 is jumping — shows 60%, then 45%, then 70% within minutes of unplugging.
The fuel gauge IC on the VGN-U series loses its calibration reference when the original cell is removed. Without a known voltage-curve baseline, it estimates state-of-charge erratically across the new cell's discharge curve. This settles after two to three full discharge-and-recharge cycles. Let the laptop discharge fully to hibernate-cutoff, then charge uninterrupted to 100% — repeat twice and the gauge IC locks onto the new cell's profile.
The VGN-U50 charges to 80% then stops — the indicator light stays amber and nothing happens.
The VGN-U50 BIOS includes a charge-limit threshold that activates when the battery learn cycle has not been completed — it holds charge at roughly 80% as a conservative safety ceiling until the cell's capacity is verified. This is firmware behaviour, not a fault in the replacement cell. Run one full discharge to hibernate-cutoff, then plug in and leave it to charge without interruption. Once the learn cycle completes, the BIOS releases the threshold and charging continues to 100%.
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