Sony VAIO VPC-W111XX/P 11.1V Replacement Battery VGP-BPS18
Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.
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Sony VAIO VPC-W111XX/P 11.1V Replacement Battery VGP-BPS18 - 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
⚠️ 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 VPC-W111XX/P 11.1V Replacement Battery VGP-BPS18 - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
4400mAh
Sony VAIO VPC-W111XX Series — 11.1V Li-ion Replacement Battery (VGP-BPS18)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion replacement battery for the Sony VAIO VPC-W111XX netbook series. It fits VPC-W111XX/P, VPC-W111XX/PC, VPC-W111XX/T, VPC-W111XX/W, and over 98 additional VAIO W-series models. OEM part numbers VGP-BPS18 and VGP-BPL18 cross-reference directly to this cell.
- VAIO VPC-W111XX series fit: All VPC-W111XX variants share the same 11.1V three-cell rail, identical connector pinout, and BMS handshake protocol — which is why one cell covers the entire W-series lineup without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a VPC-W111XX unit. The BMS negotiated correctly with the VAIO's charge controller, held voltage above the low-cutoff threshold through full discharge, and accepted a complete charge cycle without interruption or fault flags.
- First-cycle calibration on the VAIO W series: After installing, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The VAIO's BIOS reads health data stored in the battery's EEPROM, not the live cell voltage. When a new cell is installed, the EEPROM contains factory-default data that doesn't match the BIOS's stored discharge history for the old pack. The system flags this mismatch as a fault. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% resets the learn cycle and rewrites the BIOS's reference data. After two to three cycles, the health reading normalises.
VAIO shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC hasn't yet calibrated against the new cell's discharge curve. The IC carries forward voltage-to-capacity mapping from the old, degraded pack. Under combined CPU and display load, the new cell hits a voltage cliff that the uncalibrated gauge misreads as 20–30% remaining. The laptop shuts down because actual cell voltage has dropped below the safe cutoff while the gauge still shows capacity. Force a full discharge to hibernate, then charge to 100% without interruption — the fuel gauge recalibrates at that floor and ceiling, and the reported percentage will track accurately from the next cycle onward.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Sony
- Manufacturer: CS
- Series: Standard
- Color: Silver
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
Sony VAIO showing "unknown battery" or 0% right after I put the new battery in — is something wrong with it?
Nothing is wrong with the cell. The VAIO BIOS reads identity and health data from the battery's EEPROM, and on a fresh cell that data hasn't synced with the system yet. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. That single learn cycle writes the BIOS reference data and clears the unknown or 0% reading.
System info shows the wrong Wh rating for this battery — it lists something completely different from what I ordered.
The Wh figure shown in Windows or the VAIO status utility pulls from the EEPROM's rated-capacity field, not a live measurement of the actual cell. A new cell's EEPROM value won't match the old pack's figure the system previously stored. After two full charge and discharge cycles, the fuel gauge IC recalculates against the real cell chemistry and the reported Wh value settles to the correct number — 48.84Wh for this cell.
New battery charges fine but the percentage jumps around wildly for the first few days.
The fuel gauge IC maps voltage to percentage using a discharge curve learned from the previous cell. With a new cell installed, that curve is wrong until the IC collects real data. The gauge will over-report, under-report, and jump non-linearly until it has enough cycles to build an accurate profile. Run three full discharge-to-hibernate, charge-to-100% cycles without interrupting mid-charge, and the percentage tracking stabilises.
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