Toshiba Libretto 100 Replacement Battery PA2431 10.8V 3000mAh
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Toshiba Libretto 100 Replacement Battery PA2431 10.8V 3000mAh - 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.
Toshiba Libretto 100 Replacement Battery PA2431 10.8V 3000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
3000mAh
Toshiba Libretto 100 / 110 Series — 10.8V Li-ion Replacement Battery (PA2431)
This is a 10.8V, 3000mAh Li-ion replacement battery for the Toshiba Libretto 100, 100CS, 100CT, and 110 series ultraportable notebook computers. It replaces OEM part numbers PA2431, PA2502, PA2503, and their UR variants. Fit these models and the voltage rail, cell format, and connector all match the original spec.
- Libretto 100 and 110 series compatibility: These models share the same battery bay geometry, 10.8V three-cell series configuration, and connector pinout. The BMS handshake protocol is identical across the 100CS, 100CT, and 110 variants, so one cell works across the full range without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Libretto unit. The BMS negotiated correctly, charge termination triggered at the expected cutoff voltage, and the fuel gauge IC registered the new cell without throwing an error state.
- First-cycle discharge protocol for the Libretto: After installing, run the laptop on battery until it hibernates at low-voltage cutoff — do not interrupt. Then charge uninterrupted to 100%. This single full cycle resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on these older Toshiba units.
BIOS reporting poor battery health immediately after fitting a new cell
The Libretto's BIOS reads health data stored in the battery's EEPROM. When a new cell is installed, that EEPROM contains factory default values that do not match the host system's charge history. The BIOS interprets the mismatch as a degraded or unknown battery and flags it accordingly. Running one complete discharge-to-hibernate then a full uninterrupted charge writes fresh cycle data and resolves the warning on the next boot.
Libretto shutting down suddenly while the OS still shows 20–30% remaining
This is a voltage cliff failure, not a fuel gauge error. Under combined CPU and display load, cell voltage drops faster than the fuel gauge IC can track. The BIOS sees the voltage fall below its cutoff threshold and cuts power immediately — even though the displayed percentage had not reached zero. The fix is a full calibration cycle: discharge completely to hibernate, charge to 100%, and let the fuel gauge IC map the new cell's actual voltage curve. After two full cycles the reported percentage and actual cutoff align.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Toshiba
- Manufacturer: CS
- Series: Standard
- Color: Grey
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The Libretto shows the battery as "unknown" or 0% right after I put in the new cell — is it dead?
No — this is an EEPROM data mismatch. The new cell's EEPROM holds factory defaults the BIOS doesn't recognise as a valid charge history. Run the laptop on battery until it hibernates at low-voltage cutoff, then charge uninterrupted to 100%. After that single learn cycle, the BIOS registers the cell correctly and the percentage reads normally.
My Libretto's battery indicator jumps around wildly — showing 60%, then 90%, then 40% within minutes of unplugging.
The fuel gauge IC is calibrating against a new cell with a different voltage-to-capacity curve than the original. It hasn't mapped the discharge profile yet, so the readings are unstable. Run two complete discharge-to-hibernate cycles followed by full uninterrupted charges. After the second cycle the fuel gauge IC locks onto the new curve and the percentage stabilises.
System information on my Libretto is showing the wrong Wh rating — it says something lower than the spec on the battery label.
The Wh figure in system info is pulled from the EEPROM on the old or installed cell, not calculated live. A factory-default EEPROM on a replacement cell may carry a rated value from a different cell grade. This is an EEPROM reporting difference, not a capacity fault. Run one full discharge-to-hibernate and full recharge — the system will recalculate actual Wh from the measured voltage and current data and update the displayed figure.
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