About this replacement
Toshiba Satellite L900 / L950 Series — 14.8V Li-ion Replacement Battery (PA5076R-1BRS)
This is a 14.8V, 2200mAh (32.56Wh) Li-ion replacement battery for the Toshiba Satellite L900, L950, L955, and L955D series laptops. It matches the original cell format, connector, and BMS communication spec for these notebooks. OEM part numbers covered include PA5076R-1BRS, PA5076U-1BRS, PA5077U-1BRS, PABAS268, and PABAS269.
- Satellite L900 and L950 series fit: These models share the same 14.8V four-cell Li-ion architecture, identical battery bay dimensions, and the same SMBUS handshake protocol — which is why one cell covers the full range without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on Satellite L950 hardware. The BMS completed a full charge sweep without interruption, and the protection circuit tripped correctly at the low-voltage floor — no spurious cutoffs.
- First-cycle reset after install: After fitting this battery, run the laptop down to hibernate cutoff on battery alone, then charge uninterrupted to 100%. This clears the BIOS battery learn cycle and resets the fuel gauge IC against the new cell's actual capacity — skipping it causes the health warning that shows up after most cell swaps.
Why the Satellite L900 shuts down at 20–30% after a battery swap
The Satellite L900's BIOS tracks battery state using stored discharge curves from the previous cell. When a new cell goes in, those curves no longer match the actual voltage profile of the replacement. Under full CPU and display load, the laptop hits a voltage drop the BIOS interprets as empty — even though the fuel gauge still reads 20–30%. Running two full discharge-to-hibernate and uninterrupted charge cycles recalibrates the fuel gauge IC and clears the mismatch. After calibration, the cutoff point aligns with actual cell depletion around 14.4–14.6V under load.
BIOS reporting battery health as "poor" or "replace" immediately after install
The Satellite's BIOS reads health data from the battery's EEPROM, which on a new replacement cell defaults to a conservative factory-state value — not a degraded reading. The BIOS compares this against its own tracked cycle history from the old battery and flags a mismatch as poor health. This is not a fault with the replacement cell. Run the full discharge-to-hibernate cycle once, then charge to 100% without interruption, and the BIOS will rewrite its baseline — the warning clears on the next boot.