Toshiba Satellite A80 PA3399U Replacement Battery 10.8V 8800mAh
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Toshiba Satellite A80 PA3399U Replacement Battery 10.8V 8800mAh - 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 Satellite A80 PA3399U Replacement Battery 10.8V 8800mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
8800mAh
Toshiba Satellite A80-116 / M40-307 / Tecra A3-181 — 10.8V Li-ion Replacement Battery (PA3399U-1BAS)
This is a 10.8V, 8800mAh (95.04Wh) Li-ion replacement battery for the Toshiba Satellite A80-116, Satellite M40-307, Tecra A3-181, and Satellite M100-ST5111, among others. It replaces OEM part numbers PA3399U-1BAS, PA3399U-1BRS, PA3400U-1BAS, PA3478U-1BRS, PABAS057, PABAS076, and PABAS077. Physical dimensions are 206.60 x 91.40 x 26.40mm.
- Satellite A80 / M40 / Tecra A3 platform fit: These models share the same 10.8V three-cell-series voltage rail, identical connector pinout, and a common BMS handshake protocol — which is why one part number spans all of them. The fuel gauge IC on each model reads the same EEPROM registers, so the battery communicates charge state the same way across the range.
- Bench tested on actual hardware: We cycled this cell on a Satellite A80 chassis and confirmed the BMS handshake completed on first insertion, charge current ramped normally from bulk to taper phase, and the BIOS accepted the battery without throwing a health warning after the learn cycle completed.
- Post-install calibration on the Satellite A80: After fitting, run the laptop on battery until Windows triggers hibernate at low charge, then charge uninterrupted to 100% without powering on mid-cycle. This gives the BIOS fuel gauge IC one full reference sweep against the new cell chemistry and clears the inaccurate health flag that appears after every cell swap on this platform.
Why the Satellite A80 shuts down at 20–30% remaining after a battery swap
The Satellite A80's BIOS maps shutdown voltage against the discharge curve stored in the old cell's EEPROM. When a new cell goes in, that stored curve no longer matches the actual chemistry, so the BIOS sees a voltage cliff earlier than it should and triggers a hard shutdown. The fix is a single full discharge-to-hibernate followed by an uninterrupted charge to 100% — this forces the fuel gauge IC to rebuild its reference table. After two or three cycles the reported percentage tracks correctly under CPU and display load. If the laptop still cuts out, check BIOS power settings and confirm the low-battery shutdown threshold is set to 5% or lower.
BIOS showing battery health as "poor" or capacity as 0% on first boot
This happens because the EEPROM on the replacement cell carries factory-default values that don't match the Satellite A80's accumulated charge history. The BIOS reads those values on POST and flags a mismatch as a health fault — it is not a cell defect. Run one full discharge-to-hibernate cycle, then charge to 100% without interruption. On second boot, the BIOS battery learn cycle completes and the health status resets. If the warning persists after two full cycles, confirm the BIOS is current — Toshiba issued firmware updates for A80 that refined the battery register thresholds.
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 Satellite A80 says the battery Wh rating in System Information doesn't match what's on the label — is the cell faulty?
It's not a fault. The Wh figure Windows pulls comes from the EEPROM on the battery itself, which carries a factory-rated value based on the cell chemistry spec at manufacture. The label on the physical battery reflects nominal rated capacity under standard test conditions, and the two numbers can differ slightly depending on how Windows calculates from voltage and reported mAh. Run one full calibration cycle — discharge to hibernate, charge uninterrupted to 100% — and the reported Wh value will stabilise as the fuel gauge IC maps the actual cell against its reference curve.
The fuel gauge on my Satellite A80 is jumping around — showing 60%, then 45%, then 70% within minutes of unplugging. What's happening?
The fuel gauge IC on this platform needs two or three full discharge-and-charge cycles to calibrate against a new cell. Until those cycles complete, it interpolates charge state from the old cell's stored curve, which doesn't match the new chemistry — so the percentage reading oscillates. Don't rely on the percentage for the first three cycles. Let the laptop discharge to the hibernate cutoff each time, then charge uninterrupted to 100%. By cycle three, the gauge IC has enough reference data to track accurately.
The Satellite A80 won't charge the new battery above 80% — it just stops and the charge light goes out.
This is usually a BIOS-controlled charge limit, not a battery fault. Some Toshiba BIOS versions include an eco-charge mode that caps charging at 80% to reduce cell wear — check the Toshiba Power Saver or HWSetup utility under the battery tab and disable the charge limit if it's enabled. If no limit is set in software, the cell may still be in its first calib
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