Toshiba Dynabook CX/45C Replacement Battery PA3593U-1BAS 10.8V
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Toshiba Dynabook CX/45C Replacement Battery PA3593U-1BAS 10.8V - 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 CX/45C Replacement Battery PA3593U-1BAS 10.8V - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
Toshiba Dynabook CX/45C Series — 10.8V Li-ion Replacement Battery (PA3593U-1BAS)
This is a 10.8V, 4400mAh (47.52Wh) Li-ion battery for the Toshiba Dynabook CX series. It fits the CX/45C, CX/45D, CX/45E, CX/47C, and over 100 additional Dynabook CX variants sharing the PA3593U-1BAS / PA3594U-1BRS platform. The connector, BMS handshake protocol, and cell configuration match the original factory specification.
- Dynabook CX platform compatibility: These CX models share a common battery bay form factor, 10.8V three-cell series configuration, and the same BMS communication line. Any variant in this cluster that accepts PA3593U-1BAS, PA3594U-1BRS, or PABAS111 will seat and communicate correctly with this cell.
- Bench tested on actual hardware: We ran this battery through charge and discharge cycles on a CX-platform unit. The BMS reported correct voltage at each state-of-charge threshold, charge termination fired at the expected full-cell voltage, and no protection trips occurred during load transitions.
- First-install calibration on the Dynabook CX: After fitting, discharge the laptop fully to hibernate-cutoff — do not manually power off — then charge uninterrupted to 100%. This forces the Dynabook's fuel gauge IC to map its state-of-charge curve against the new cell and clears the inaccurate health warning that appears in Toshiba's battery utility after every cell swap.
Why the Dynabook CX shuts down at 20–30% after a battery swap
The Dynabook's fuel gauge IC retains state-of-charge data from the old, degraded cell. When a new cell is installed without running a calibration cycle, the IC's discharge curve is misaligned — it triggers a low-battery shutdown well before the cell is actually depleted. This is not a fault with the replacement cell. Running one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100% re-anchors the IC's curve to the new cell's actual capacity. After two or three full cycles, the gauge reading stabilises.
BIOS showing battery health as "poor" or capacity as 0% on a new cell
The Toshiba BIOS reads health data from EEPROM registers that store cycle count and rated capacity from the previous battery. On first install, these values haven't been updated to reflect the new cell, so the BIOS reports poor health or zero capacity. This is an EEPROM data lag, not a defective battery. Boot into the Toshiba Battery Utility (or run a full learn cycle via Windows Battery Report), complete one full discharge-to-hibernate and charge-to-100% pass, and the BIOS will re-read the updated register values — health should report correctly within one to two cycles.
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 CX shows the wrong Wh rating in system info after fitting this battery — is the cell itself incorrect?
The Wh figure shown in Windows or Toshiba's utility is pulled from the battery's EEPROM, which initially holds the rated chemistry value from the cell manufacturer rather than a live measured figure. This creates a mismatch against what the OS expects from the old cell's stored data. It is not a sign of a wrong or underspecified battery. Run one full discharge-to-hibernate followed by a full charge, and the reported Wh figure will update to reflect the actual cell in use.
The fuel gauge on my Dynabook CX is jumping wildly — 60%, then 45%, then 70% within minutes of unplugging. What's causing it?
The fuel gauge IC calibrates its state-of-charge estimate against a known discharge curve. After a cell swap, it has no valid reference for the new cell, so estimates swing erratically until it builds one. This is normal for the first two to three cycles on a fresh Li-ion cell. Run two complete discharge-to-hibernate and charge-to-100% cycles without interruption — after the second full cycle, the gauge IC will have enough data to track the new cell accurately and the jumping will stop.
The new battery won't charge above 80% on my Dynabook CX — the charging light goes off and the status bar stops there. Is the cell faulty?
The Dynabook CX BIOS includes a charge-limit feature that caps charging at 80% when eco-charge mode is active — this is firmware behaviour, not a cell defect. Open Toshiba's Power Management utility or the Eco Utility and check whether "Battery Care Mode" or a similar charge-limit toggle is enabled. Disabling it allows the charger to run to full-cell termination voltage, which for this 10.8V pack is approximately 12.6V across the three-cell series string.
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