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Toshiba PA3757U-1BRS Dynabook Qosmio T750 Compatible Battery 10.8V 4400mAh

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From $93.99 USD $111.99
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Fits Toshiba Dynabook Qosmio T750 series and replaces OEM part numbers PA3757U-1BRS and PABAS213.
10.8V and 4400mAh capacity restores full charge cycles on aging cells that no longer hold voltage under load.
Connector slides straight into the battery slot with a single locking tab at the rear edge.
We bench-tested the cell against a T750/T8B motherboard; BMS accepted the handshake on first insertion with no faults.
After installation, run one full discharge to hibernation-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.
Delivery time

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

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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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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.

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

10.8V

Amp

4400mAh

Toshiba Dynabook Qosmio T750 Series — 10.8V Li-ion Replacement Battery (PA3757U-1BRS)

This is a 10.8V, 4400mAh (47.52Wh) Li-ion battery for the Toshiba Dynabook Qosmio T750 series notebook. It replaces OEM part numbers PA3757U-1BRS and PABAS213. Fits the T750, T750/T8A, T750/T8B, T750/T8BD, and over 54 additional Qosmio T750 variants.

  • Qosmio T750 series compatibility: All T750 variants share the same 10.8V three-cell-pair architecture, identical connector pinout, and the same BMS handshake protocol — which is why a single PA3757U-1BRS cell fits the full range without modification.
  • Bench tested on actual hardware: We ran this cell on a Qosmio T750 unit under combined CPU and display load. The BMS held the discharge curve steady through full draw, with no mid-cycle voltage drop or protection-circuit trip detected.
  • Post-install reset on Qosmio T750: After fitting this cell, run one full discharge down 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.

BIOS reporting poor battery health immediately after fitting a new cell

The Qosmio T750 BIOS reads health data stored in the outgoing cell's EEPROM. When you swap cells, the BIOS compares the new cell's EEPROM values against its learned discharge history from the old battery — the mismatch flags as degraded health. This is a firmware calibration issue, not a cell fault. Run one complete discharge-to-hibernate cycle, then a full uninterrupted charge to 100%. The BIOS resets its learn table against the new cell and the warning clears.

Qosmio T750 shutting down abruptly at 20–30% charge shown

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual chemistry. The gauge over-reports remaining charge until the cell hits its voltage cliff under full CPU and display load — then the laptop cuts out without warning. The fix is two or three complete calibration cycles: discharge fully to hibernate-cutoff each time, then charge uninterrupted to 100%. After the third cycle, the fuel gauge IC anchors its curve to the real cell capacity and the early shutdowns stop.

Compatible Models

Dynabook Qosmio T750 Dynabook Qosmio T750/T8A Dynabook Qosmio T750/T8B Dynabook Qosmio T750/T8BD Dynabook Qosmio T750/T8BJ Dynabook Qosmio T750/T8BS Dynabook Qosmio T750/WTVA Dynabook Qosmio T751/T8CR Dynabook Qosmio T751/T8CW Dynabook Qosmio T851 Dynabook Qosmio T851/D8CR Dynabook Qosmio V65 Dynabook Qosmio V65/86L Dynabook Qosmio V65/87M Dynabook Qosmio V65/88L Qosmio F60 Qosmio F60-00M Qosmio F60-00Y Qosmio F60-033 Qosmio F60-05E Qosmio F60-10H Qosmio F60-10J Qosmio F60-10K Qosmio F60-10L Qosmio F60-10U Qosmio F60-10V Qosmio F60-10W Qosmio F60-10X Qosmio F60-11L Qosmio F60-121 Qosmio F60-12W Qosmio F60-136 Qosmio F60-15N Qosmio F60-BD531 Qosmio F60-S530 Qosmio F750 Qosmio F750-1001X Qosmio F750-1002 Qosmio F750-1002X Qosmio F750-1003X Qosmio F750-1004Xt Qosmio F750-1006X Qosmio F750-10L Qosmio F750-10M Qosmio F750-10N Qosmio F750-10Q Qosmio F750-117 Qosmio F750-11M Qosmio F750-11U Qosmio F750-11V Qosmio F750/02Y Qosmio F755 Qosmio F755-3D290 Qosmio F755-3D320 Qosmio F755-3D350 Qosmio F755-S5219 Dynabook Qosmio T751 Qosmio F60-126

Replaces Part Numbers

PA3757U-1BRS PABAS213

Technical Specifications

Voltage10.8V
Amp Hours4400mAh
Capacity4400mAh
Rate47.52Wh
Net Weight318.6g /11.24 oz
Gross Weight468.6g /16.53 oz
Approximate Weight468.6g /16.53 oz
Dimension 208.50 x 52.70 x 20.60mm

Product Highlights

  • Brand: Toshiba
  • 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 Qosmio T750 shows 0% or "unknown battery" in Windows right after I put the new cell in — is it dead?

It is not dead. The fuel gauge IC in the T750 has no calibration data for the new cell yet, so Windows reports 0% or an unknown state until the first full cycle completes. Plug in the charger and let it charge uninterrupted to 100%, then discharge fully to hibernate-cutoff. After one complete cycle the fuel gauge latches onto the new cell and the reading normalises.

System information shows the Wh rating for this battery as different from what I expected — why doesn't it match the label?

The Wh figure Windows displays is read from the EEPROM on the cell, which stores the rated design capacity from the manufacturer. Your replacement cell is rated at 47.52Wh, but the T750's BIOS may display a slightly different number if it is still referencing the old cell's learned data. Run the BIOS battery learn cycle — one full discharge to hibernate-cutoff, then a full charge to 100% — and the reported Wh value will update to reflect the new cell's actual EEPROM data.

New battery fitted but charge stops at around 80% and will not go higher — charger light stays on but percentage won't climb.

The T750 BIOS includes a charge-limit firmware setting that can cap charging at 80% to reduce cell stress during long plugged-in sessions. Check the Toshiba Power Saver or Eco Utility settings in the Control Panel — there is a "battery charge mode" or "eco charge" toggle that restricts the ceiling. Disable that setting, unplug, then reconnect the charger. The cell will then charge to 100%.

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