Toshiba PA3451U-1BRS Satellite M70 Replacement Battery 10.8V 6600mAh
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Toshiba PA3451U-1BRS Satellite M70 Replacement Battery 10.8V 6600mAh - 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 PA3451U-1BRS Satellite M70 Replacement Battery 10.8V 6600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
6600mAh
Toshiba Satellite M70-208 — 10.8V Li-ion Replacement Battery (PA3451U-1BRS)
This is a 10.8V, 6600mAh Li-ion battery for the Toshiba Satellite M70-208 and compatible Satellite A and M series notebooks. It replaces OEM part numbers PA3451U-1BRS, PA3457U-1BRS, PA3465U-1BRS, and PABAS067. The cell matches the original voltage rail and connector pinout so the BIOS can communicate with the battery management system.
- Satellite A and M series compatibility: These models share a common battery bay geometry and the same 10.8V three-cell-series configuration. The BMS handshake uses the same EEPROM protocol across the range, so one cell works across all listed variants without adapter modifications.
- Bench tested on actual hardware: We ran this cell on a Satellite M70 platform and confirmed the BMS completed a full charge cycle without triggering a protection cutoff. The BIOS recognised the battery at first boot and reported voltage correctly.
- Post-install calibration cycle: After fitting this battery, discharge the laptop to hibernate-cutoff under normal load, then charge it uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap.
Why the Satellite M70 BIOS reports poor battery health after a cell swap
The Satellite M70 stores battery health data in the EEPROM on the old cell. When you fit a new battery, the BIOS reads no historical charge data and flags the health as poor or unknown — even though the cell is new. This is not a fault with the replacement. Running one full discharge-to-hibernate followed by an uninterrupted charge gives the BIOS enough data to rebuild its health estimate. After two to three full cycles, the health indicator typically returns to normal.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not calibrated against the new cell's actual voltage curve. The gauge uses the old cell's discharge profile, so it misjudges where the voltage cliff is — and the laptop cuts power before the display reads zero. The fix is to complete two or three full discharge-to-hibernate and full-charge cycles without interrupting the charge. After calibration, the shutdown point aligns with the actual cell cutoff voltage of 9.0V under load.
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
The Toshiba Satellite shows the battery as 0% or "unknown" right after I installed the new cell — is it dead?
No — the BIOS is reading EEPROM data that doesn't exist yet on the new cell, so it reports unknown or zero until it collects charge history. Plug in the AC adapter and let the battery charge to 100% without interruption. Then discharge to hibernate-cutoff once under normal use. After that first full cycle the BIOS will register the cell correctly and the percentage will display accurately.
The fuel gauge on my Satellite M70 is all over the place — it jumped from 60% to 15% in minutes. What's wrong?
The fuel gauge IC is still running its estimate against the old cell's discharge curve, which doesn't match the new cell's chemistry profile. It takes two to three full discharge-and-recharge cycles for the IC to recalibrate. Do not top up or interrupt charges during this period — let each cycle go from hibernate-cutoff all the way to 100%. The gauge stabilises once the IC has enough data points to map the new voltage curve accurately.
My Satellite is showing 71Wh in the battery info screen but I expected a different Wh rating — is something wrong with the cell?
Nothing is wrong. The 71.28Wh figure is the rated capacity stored in the replacement cell's EEPROM and it matches the product spec — 10.8V at 6600mAh equals 71.28Wh. Some older Toshiba OEM cells reported a slightly different Wh value in system info due to rounding differences in the original firmware. The actual chemistry and capacity are correct — confirm by checking that voltage reads 10.8V at full charge, which it should.
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