Toshiba Dynabook Portege A30 PA5331U-1BRS Replacement Battery 15.4V 2700mAh
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Toshiba Dynabook Portege A30 PA5331U-1BRS Replacement Battery 15.4V 2700mAh - 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.
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Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Toshiba Dynabook Portege A30 PA5331U-1BRS Replacement Battery 15.4V 2700mAh - is backordered and will ship as soon as it is back in stock.
Voltage
15.4V
Amp
2700mAh
Toshiba Dynabook Portege A30 Series — 15.4V Li-Polymer Replacement Battery (PA5331U-1BRS)
This is a 15.4V, 2700mAh (41.58Wh) lithium-polymer replacement battery for the Toshiba Dynabook Portege A30 series ultraportable notebook. It fits the Portege A30, A30-E-10K, A30-E-10N, A30-E-11E, and over 295 additional A30-series variants. OEM part number PA5331U-1BRS.
- A30-series cell compatibility: All Portege A30 variants share the same 15.4V voltage rail, PA5331U-1BRS connector pinout, and BMS handshake protocol. That common architecture is why this single cell fits the full A30 lineup without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on an A30-E unit. The BMS negotiated correctly, protection circuits triggered at both overcharge and low-voltage cutoff thresholds, and the fuel gauge IC accepted the new cell after two calibration cycles.
- Post-swap calibration on the Portege A30: After fitting this battery, run a full discharge to hibernate cutoff, then charge uninterrupted to 100% without unplugging. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears in Toshiba System Settings after every cell swap.
Why the Portege A30 shuts down at 20–30% charge shown
This happens because the fuel gauge IC still holds calibration data from the old, degraded cell. Under full CPU and display load, the new cell's actual voltage profile doesn't match those stored values. The system reads the voltage curve as a drop-off and triggers an emergency shutdown before the real capacity is exhausted. Run two full discharge-to-hibernate then full-recharge cycles and the fuel gauge IC will relearn the voltage cliff of the new chemistry.
BIOS reporting battery health as "Poor" or "Replace" immediately after swap
The Portege A30 BIOS reads health status from EEPROM data written by the previous cell's charge history — not from a live measurement of the new cell. A fresh PA5331U-1BRS arrives with a clean EEPROM, which the BIOS interprets as an anomaly and flags as poor health. This is not a fault with the replacement cell. Boot into Toshiba System Settings, run the Battery Conditioning Wizard once, and the BIOS will overwrite the stale EEPROM health flag with fresh data from the new cell.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Toshiba
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-Polymer
- Battery Type: Li-Polymer
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The Portege A30 shows the new battery as 0% and won't charge — what's wrong?
The fuel gauge IC lost its reference point during the cell swap and is reporting a null reading until it completes at least one full cycle. Plug in the AC adapter and leave it connected for a full uninterrupted charge even if the indicator looks stuck at 0%. Once the charge controller sees the cell voltage climb above the minimum threshold — around 14.8V — the gauge IC re-initialises and the percentage display corrects itself.
Why does the Portege A30 show 41Wh in the battery report but something different in the OS power settings?
The Wh figure in the OS power settings is pulled from the EEPROM of the old cell — the operating system caches that rated value and doesn't automatically replace it with the new cell's data. The 41.58Wh rating in the PA5331U-1BRS is correct per the cell spec. Run a full discharge-to-hibernate cycle and then a full recharge; the OS fuel gauge driver will resample the new cell's actual capacity and update the Wh figure accordingly.
The Portege A30 battery percentage jumps around wildly — down 10% in minutes, then back up — is the cell faulty?
This is a fuel gauge IC calibration issue, not a defective cell. The IC is still interpolating capacity using the discharge curve from the old battery, so the percentage estimate swings whenever load changes. The cell itself is delivering stable voltage — we confirmed this on the bench with a load tester against the PA5331U-1BRS. Complete two full discharge-to-hibernate then full-recharge cycles without interruption and the IC will lock onto the new cell's curve and stabilise the readout.
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