Toshiba Satellite C800 10.8V Replacement Battery PA5023U-1BRS
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Toshiba Satellite C800 10.8V Replacement Battery PA5023U-1BRS - 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 C800 10.8V Replacement Battery PA5023U-1BRS - is backordered and will ship as soon as it is back in stock.
Voltage
10.8V
Amp
6600mAh
Toshiba Satellite C800 Series — 10.8V Li-ion Replacement Battery (PA5023U-1BRS)
This 10.8V Li-ion battery carries a 6600mAh (71.28Wh) capacity and replaces the original cells in the Toshiba Satellite C800, C800D, C805, C805D, and hundreds of related Satellite models. OEM part numbers covered include PA5023U-1BRS through PA5027U-1BRS, PABAS259–PABAS263, and PA5110U-1BRS. If your existing battery no longer holds charge or the laptop won't leave the power cable, this cell is the direct swap.
- Satellite C800 series platform fit: These models share a common 10.8V three-cell battery architecture with the same edge connector and BMS handshake protocol. One replacement cell covers the full C800/C805 line because Toshiba used a single battery bay spec across this budget Satellite generation.
- Bench tested on actual hardware: We ran this cell through full charge and load cycles on Satellite C800-series hardware. The BMS negotiated correctly with the Toshiba EC, charge current stepped down at the expected 4.2V-per-cell ceiling, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
- Post-install discharge cycle on Satellite C800: After fitting this battery, run the laptop off mains until it hibernates on low-battery cutoff — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell data and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the Satellite C800 BIOS reports poor battery health after a new cell install
The Satellite C800 EC reads health data from the battery's EEPROM on first contact. The new cell ships with factory EEPROM values that don't match the charge history the BIOS expects to see, so it flags the battery as degraded before a single cycle is complete. This is a firmware interpretation issue, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% writes fresh cycle data to the EEPROM and the health warning clears on the next boot.
Laptop shutting down at 20–30% remaining on the Satellite C800
This happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual discharge curve. Under full CPU and display load, the voltage drops faster than the uncalibrated gauge predicts, and the EC triggers a protective shutdown before the displayed percentage reaches zero. It's not a faulty cell — it's the gauge running stale data from the old battery. Complete two to three full discharge-to-hibernate and charge-to-100% cycles to let the fuel gauge IC recalibrate, then confirm the laptop sustains load down to below 10% without a sudden cutoff.
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 Satellite C800 BIOS says "consider replacing your battery" right after I installed the new one — is the cell actually bad?
No. The Satellite EC reads EEPROM cycle data on first contact and flags any cell with factory-fresh values as degraded before it has a history. Run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. That resets the BIOS learn cycle and the warning clears on the next boot.
Windows is showing a completely different Wh rating for the new battery than what's listed on the cell — why doesn't it match?
The Wh figure Windows reads comes from the battery's EEPROM, which ships with a rated design capacity value that can differ slightly from the actual cell chemistry in your specific replacement. This is an EEPROM data difference, not a capacity shortfall. The cell itself delivers 71.28Wh under load — verify this by running a full discharge cycle and checking the mWh reported in Windows Battery Report after calibration.
My Satellite C800 shuts off suddenly at around 25% battery shown — the old battery never did this on a new charge level.
The fuel gauge IC on the C800 is calibrated to the old cell's discharge curve. With a new cell installed, it misjudges the voltage cliff under CPU and display load, triggering a shutdown well above the actual empty point. Run two to three complete discharge-to-hibernate cycles followed by full uninterrupted charges to 100%. After calibration, the gauge tracks the new cell accurately and the early shutdowns stop.
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