PA3478U-1BRS Toshiba Satellite A80 Replacement Battery 10.8V 4400mAh
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PA3478U-1BRS Toshiba Satellite A80 Replacement Battery 10.8V 4400mAh - 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.
PA3478U-1BRS Toshiba Satellite A80 Replacement Battery 10.8V 4400mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
4400mAh
Toshiba Satellite A80 / M40 / Tecra A3 Series — 10.8V Li-ion Replacement Battery (PA3478U-1BRS)
This is a 10.8V, 4400mAh Li-ion replacement battery for Toshiba Satellite and Tecra laptops. It fits the Satellite A80-116, Satellite M40-300, Tecra A3-181, Satellite M100-ST5111, and over 300 additional models sharing the same connector and BMS protocol. OEM part numbers covered include PA3478U-1BRS, PA3399U-1BRS, PA3400U-1BRS, PABAS076, and PABAS057.
- Satellite and Tecra shared platform: These models run the same 10.8V power rail and use an identical dock connector with the same BMS handshake. One cell pack covers all of them without adapter modifications or firmware differences between models.
- Bench tested on actual hardware: We ran this cell on a Satellite M40-300 and a Tecra A3-181. The BMS authenticated on first boot, charge initiated without manual reset, and the fuel gauge IC tracked the new cell through two full cycles before locking in stable capacity reporting.
- Post-install discharge cycle on Toshiba laptops: After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. Toshiba's BIOS battery learn cycle depends on this sequence. Skipping it causes the BIOS to hold stale health data from the old cell and flag the new battery as degraded.
BIOS reporting poor battery health immediately after cell swap
Toshiba laptops store battery health data in EEPROM, tied to the previous cell's charge history. When you swap the physical cell, the BIOS does not automatically clear that data — it reads the old EEPROM profile against the new cell and flags a mismatch as poor health. This is not a fault with the replacement battery. To clear it, run one full discharge to hibernate, then a full uninterrupted charge to 100%. After two complete cycles, the BIOS learn cycle overwrites the old EEPROM values and the health warning clears.
Laptop shuts down abruptly at 20–30% charge shown on screen
This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load, even though the OS fuel gauge still reads 20–30%. The fuel gauge IC is reading stored capacity estimates, not live cell voltage — the two diverge when a cell ages or after a swap before calibration completes. Under full load, the voltage cliff arrives faster than the gauge predicts, and the BMS cuts power to protect the cell. Run two full discharge-to-hibernate and full-recharge cycles to give the fuel gauge IC accurate data points against the new cell; after calibration, the shutdown threshold and the displayed percentage will align.
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 Toshiba Satellite shows the battery as "unknown" or 0% right after fitting the new cell — what's happening?
The OS fuel gauge IC is reading EEPROM data left behind by the old battery and cannot match it to the new cell's chemistry profile. This is a calibration gap, not a faulty replacement. Run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. After that first complete cycle, the fuel gauge IC binds to the new cell and the "unknown" or 0% reading clears.
Windows is reporting the wrong Wh rating for this battery — it shows a different number than the 47.52Wh on the product page. Is the battery mislabelled?
The Wh figure Windows displays is pulled from the EEPROM on the old cell's stored data, not from the new cell's actual chemistry. The physical cell in this pack is rated at 47.52Wh. Once the BIOS battery learn cycle completes — after two full discharge-to-hibernate and full-recharge cycles — the system rewrites the EEPROM and the reported Wh figure updates to match the installed cell.
The Tecra A3 stops charging at 80% and won't go higher — is the replacement battery faulty?
Charge stopping at 80% on Tecra and Satellite models is almost always a BIOS-controlled charge limit, not a cell fault. Toshiba's power management firmware activates this cap when it detects what it classifies as a degraded or mismatched cell — which a freshly swapped battery can trigger before calibration. Go into Toshiba Power Saver or the BIOS power settings and disable any "battery care" or charge-limit mode. If the setting is already off, run a full learn cycle — discharge to hibernate, then charge uninterrupted — and the BIOS will re-evaluate the cell and lift the 80% cap.
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