Toshiba Dynabook TX Replacement Battery 10.8V 6600mAh PA3356U-1BRS
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Toshiba Dynabook TX Replacement Battery 10.8V 6600mAh PA3356U-1BRS - 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 Dynabook TX Replacement Battery 10.8V 6600mAh PA3356U-1BRS - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
6600mAh
Toshiba Dynabook TX / Tecra A9 — 10.8V Li-ion Replacement Battery (PA3356U-1BRS)
This is a 10.8V, 6600mAh (71.28Wh) Li-ion replacement battery for the Toshiba Dynabook TX notebook. It also fits a wide range of Toshiba Satellite and Tecra models sharing the same battery bay and connector, including the Satellite U205-S5034, Tecra A9, and Tecra S3-120. The OEM part number PA3356U-1BRS is the primary reference; cross-references include PABAS048, PA3357U-1BRL, PA3509U-1BRM, and PA3588U-1BRS, among others.
- Dynabook TX and Tecra shared battery platform: These models use the same 10.8V three-cell-series architecture, identical physical bay dimensions (206.90 × 68.90 × 20.50mm), and the same BMS connector pinout. That is why one cell covers all of them — the voltage rail and handshake protocol match across the range.
- Bench tested on actual hardware: We ran this cell through full charge-discharge cycles on Dynabook TX and Tecra A9 units. The BMS accepted the cell without fault codes, balanced across all groups, and reported correct Wh figures in system information after a calibration cycle.
- First-install discharge cycle on Toshiba BIOS: After fitting this cell, run the laptop on battery only until it hibernates at low-charge cutoff. Then charge uninterrupted to 100%. Toshiba's BIOS battery learn cycle requires this to clear the inaccurate health warning that appears after every cell swap — skipping it leaves the fuel gauge reading stale EEPROM data from the old pack.
BIOS reporting poor battery health immediately after fitting a new cell
Toshiba's BIOS reads health data from EEPROM embedded in the battery pack. When a new cell is installed, that EEPROM contains factory default values that do not match the laptop's usage history, so the BIOS flags it as degraded or unknown. This is not a fault with the replacement cell. Run one complete discharge-to-hibernate cycle followed by a full uninterrupted charge — the BIOS learn cycle writes new baseline data to the EEPROM and clears the warning. After two to three full cycles, the health indicator stabilises at the correct value.
Laptop shuts down abruptly at 15–25% charge shown on screen
This happens when the cell voltage drops below the BMS cutoff threshold under full load — CPU at peak draw plus backlit display — before the fuel gauge reaches 0%. The fuel gauge IC calibrates against measured cell voltage over time, and if the calibration cycles have not completed, it misjudges the remaining capacity. The cell hits the voltage cliff and the BMS cuts output before the OS-level low-battery warning fires. Fix this by completing three full discharge-to-hibernate and charge-to-100% cycles so the fuel gauge IC can map the actual voltage curve of the new cell — after that, shutdowns at partial charge should stop.
Compatible Models
Replaces Part Numbers
Technical Specifications
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
My Dynabook TX shows the new battery as "0% available (plugged in, charging)" and it never moves — what's wrong?
The fuel gauge IC is reading stale EEPROM data from the old pack and has not yet mapped the new cell's voltage curve. This is not a charging fault — the cell is accepting charge even though the OS counter is stuck. Run the laptop unplugged until it hibernates, then charge uninterrupted to 100% without interruption. After two full cycles the fuel gauge IC recalibrates and the percentage display tracks correctly.
System information shows this battery as 48Wh but the cell is rated 71.28Wh — is the wrong battery installed?
The Wh figure in system information is pulled from the EEPROM on the battery pack, and on a new replacement cell that value defaults to the factory-programmed rated capacity of the smallest pack in the compatibility range, not the actual chemistry. The physical cell is the correct 71.28Wh unit. Complete the BIOS learn cycle — one full discharge to hibernate cutoff followed by a full charge to 100% — and the EEPROM value updates to reflect the actual installed capacity.
The Dynabook TX charges fine but the battery percentage jumps — drops from 60% to 31% instantly under load, then climbs back when idle. What causes that?
The fuel gauge IC tracks remaining capacity by measuring cell voltage, and under high CPU or display load the voltage sags sharply. If the IC's internal voltage-to-capacity table is calibrated against the old degraded cell, it misreads that sag as a steep capacity drop. When load drops, voltage recovers and the percentage jumps back up. Run three complete discharge-to-hibernate and full-charge cycles so the IC builds an accurate voltage curve for the new cell — the erratic jumps reduce and then stop by the third cycle.
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