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Sony VAIO VGN-TZ121 Replacement Battery 11.1V 6600mAh

Up to 17% off
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From $111.99 USD $134.99
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Replaces Sony VGP-BPX11 battery for VAIO VGN-TZ121, VGN-TZ130N/B, VGN-TZ131N, VGN-TZ132N ultraportable notebooks.
11.1V 6600mAh lithium-ion delivers the same capacity as original; 73.26Wh matches VAIO TZ-series power envelope for full mobile operation.
Connector type is proprietary Sony contact plate; slides into slot with locking tab on chassis left side, identical to OEM orientation.
We bench tested this cell against a known-good TZ121 charger; BMS accepted full charge cycle with no fault codes or thermal events.
After installation, fully discharge to auto-shutdown then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false health warnings common after every cell swap.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

🔹 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: 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.

Voltage

11.1V

Amp

6600mAh

Sony VAIO VGN-TZ Series — 11.1V Li-ion Replacement Battery (VGP-BPX11)

This 11.1V 6600mAh (73.26Wh) Li-ion battery replaces the OEM VGP-BPX11 unit in the Sony VAIO VGN-TZ series. It fits the VGN-TZ121, VGN-TZ130N/B, VGN-TZ131N, VGN-TZ132N, and over 100 additional TZ-series models. The cell matches the original voltage rail and connector spec so the VAIO powers on without modification.

  • TZ-series platform fit: Every VGN-TZ model in this lineup shares the same 11.1V three-cell rail, connector pinout, and BMS handshake protocol. That common architecture is why one part number covers the full TZ range — the BIOS expects the same EEPROM data structure across all variants.
  • Bench tested on actual hardware: We ran this cell through charge, idle draw, and sustained CPU load cycles on a TZ-series unit. The BMS communicated correctly with the VAIO's fuel gauge IC at every stage — no false-low alerts, no mid-cycle cutoffs.
  • First-cycle calibration after install: After fitting this battery, run the laptop off battery power until it hibernates at cutoff, then charge uninterrupted to 100% without using the machine. This single discharge-to-recharge cycle resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.

VAIO TZ BIOS reporting poor health immediately after fitting a new cell

The VGN-TZ BIOS reads battery health from EEPROM data written by the previous cell — not from live voltage measurements. When a new cell arrives, the BIOS compares stored cycle count and capacity history against the fresh cell and flags a mismatch. This is a data conflict, not a hardware fault. One full calibration cycle — discharge to hibernate, then uninterrupted charge to 100% — rewrites the BIOS battery learn data and clears the warning.

Laptop shutting down at 20–30% charge shown on the gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The IC is still referencing voltage thresholds mapped to the old, degraded cell — so it calls 0% too early. The fix is two to three full discharge-to-full-charge cycles without interruption. After those cycles, the gauge recalibrates and the cutoff point drops back to near 0% — confirmed at roughly 10.5V terminal voltage under load before hibernate kicks in.

Compatible Models

VAIO VGN-TZ121 VAIO VGN-TZ130N/B VAIO VGN-TZ131N VAIO VGN-TZ132N VAIO VGN-TZ160N/B VAIO VGN-TZ180N/RC VAIO VGN-TZ185N/WC VAIO VGN-TZ195N/XC VAIO VGN-TZ198N/RC VAIO VGN-TZ270N/B VAIO VGN-TZ285N/RC VAIO VGN-TZ295N/XC VAIO VGN-TZ298N/XC VAIO VGN-TZ340 VAIO VGN-TZ36GN/S VAIO VGN-TZ370N/B VAIO VGN-TZ390 VAIO VGN-TZ398U/XC VAIO VGN-TZ50B VAIO VGN-TZ71B VAIO VGN-TZ72B VAIO VGN-TZ73B VAIO VGN-TZ91S VAIO VGN-TZ11MN/N VAIO VGN-TZ11VN/X VAIO VGN-TZ11XN/B VAIO VGN-TZ13 VAIO VGN-TZ13/B VAIO VGN-TZ13/N VAIO VGN-TZ13/W VAIO VGN-TZ150 VAIO VGN-TZ150N/B VAIO VGN-TZ150N/N VAIO VGN-TZ16 VAIO VGN-TZ16GN/B VAIO VGN-TZ16N VAIO VGN-TZ16N/B VAIO VGN-TZ170 VAIO VGN-TZ170N/B VAIO VGN-TZ170N/N VAIO VGN-TZ17 VAIO VGN-TZ17GN VAIO VGN-TZ17GN/B VAIO VGN-TZ17GN/N VAIO VGN-TZ17N VAIO VGN-TZ17N/X VAIO VGN-TZ18 VAIO VGN-TZ18GN/X VAIO VGN-TZ18N VAIO VGN-TZ18N/R VAIO VGN-TZ18N/X VAIO VGN-TZ190 VAIO VGN-TZ190N/B VAIO VGN-TZ190N/BC VAIO VGN-TZ191 VAIO VGN-TZ191N/X VAIO VGN-TZ191N/XC VAIO VGN-TZ21 VAIO VGN-TZ21MN/N VAIO VGN-TZ21VN/R VAIO VGN-TZ21VN/X VAIO VGN-TZ21WN/B VAIO VGN-TZ250 VAIO VGN-TZ250N/B VAIO VGN-TZ250N/N VAIO VGN-TZ250N/P VAIO VGN-TZ27 VAIO VGN-TZ27N VAIO VGN-TZ27N/R VAIO VGN-TZ27N/X VAIO VGN-TZ28 VAIO VGN-TZ28N VAIO VGN-TZ28N/R VAIO VGN-TZ290 VAIO VGN-TZ290EAB VAIO VGN-TZ290EAN VAIO VGN-TZ290EAP VAIO VGN-TZ31 VAIO VGN-TZ31MN/N VAIO VGN-TZ31VN/X VAIO VGN-TZ31WN/B VAIO VGN-TZ33 VAIO VGN-TZ33/B VAIO VGN-TZ33/N VAIO VGN-TZ33/W VAIO VGN-TZ350 VAIO VGN-TZ350N/B VAIO VGN-TZ350N/N VAIO VGN-TZ350N/P VAIO VGN-TZ37 VAIO VGN-TZ37GN/B VAIO VGN-TZ37GN/N VAIO VGN-TZ37GN/P VAIO VGN-TZ37N/G VAIO VGN-TZ37N/P VAIO VGN-TZ37N/R VAIO VGN-TZ37N/X VAIO VGN-TZ38 VAIO VGN-TZ38GN/X VAIO VGN-TZ38N/X VAIO VGN-TZ90 VAIO VGN-TZ90HS VAIO VGN-TZ90NS VAIO VGN-TZ90S VAIO VGN-TZ91 VAIO VGN-TZ91HS VAIO VGN-TZ91NS VAIO VGN-TZ92 VAIO VGN-TZ92HS VAIO VGN-TZ92NS VAIO VGN-TZ92S VAIO VGN-TZ93 VAIO VGN-TZ93NS VAIO VGN-TZ93S VAIO VGN-TZ93US

Replaces Part Numbers

VGP-BPX11

Technical Specifications

Voltage11.1V
Amp Hours6600mAh
Capacity6600mAh
Rate73.26Wh
Net Weight470g /16.58 oz
Gross Weight650g /22.93 oz
Approximate Weight650g /22.93 oz
Dimension 225.42 x 48.11 x 43.90mm

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 replacement battery Wh rating as lower than the spec — is the cell undersized?

The Wh figure displayed in Windows or VAIO Care pulls from the EEPROM on the battery, which stores the manufacturer's rated capacity at cell manufacture date. The actual chemistry in this 6600mAh cell delivers 73.26Wh, but the EEPROM value and the OS-reported figure can differ until the fuel gauge IC runs a full calibration cycle. Run one complete discharge-to-hibernate followed by an uninterrupted charge to 100% — the reported Wh figure will align with the physical cell after that cycle.

The VAIO fuel gauge is jumping around wildly — showing 80%, then 45%, then back to 70% within minutes.

The fuel gauge IC on the TZ motherboard learns a new cell's voltage-to-capacity curve over the first few cycles. Until it has that data, it interpolates against the old cell's profile and produces erratic readings. This is not a fault with the replacement cell. Run two to three full discharge-and-charge cycles without stopping partway — by the third cycle the gauge IC has enough data to track the new cell accurately and the jumping stops.

New battery installed, VAIO charges to 80% then stops — charger light stays green but percentage won't climb.

Some TZ-series BIOS firmware versions activate a charge-limit ceiling at 80% as a cell-preservation measure — this is a BIOS setting, not a fault with the replacement battery. Go into VAIO Control Center, find the Battery Care Function setting, and switch it from Long Life mode to Full Charge mode. After changing that setting and reconnecting the charger, the cell will charge past 80% and reach 100% at approximately 12.6V across the pack terminals.

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Sony VAIO VGN-TZ121 Replacement Battery, 11.1V, 6600mAh, Li-ion 1

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