Toshiba Tecra 8200 Replacement Battery B412 10.8V 4400mAh

Toshiba Tecra 8200 — 10.8V Li-ion Replacement Battery (PA3062U-1BAT)

This is a 10.8V Li-ion battery rated at 4400mAh (47.52Wh), built to replace the original cell in the Toshiba Tecra 8200 notebook. It fits directly into the Tecra 8200's battery bay and connects via the stock locking latch. OEM part numbers PA3062U-1BAR, PA3062U-1BAT, and B412 all map to this slot.

• Tecra 8200 fitment: The Tecra 8200 uses a dedicated 10.8V three-cell-series pack architecture. Voltage rail and connector pinout are specific to this chassis — swapping in a cell from a different Tecra generation will trip the BMS and prevent charging.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on the Tecra 8200 platform. The BMS handshake completed without error, charge termination triggered cleanly at full capacity, and the pack held voltage under sustained CPU and display load without sagging below the protection threshold.
• First-cycle calibration on the Tecra 8200: After installing this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on the Tecra 8200.

BIOS reporting battery health as poor after installing this cell

The Tecra 8200 BIOS reads health data stored in the old pack's EEPROM and compares it against the new cell's charge profile. Because the new cell has no accumulated cycle data, the BIOS flags it as degraded until the learn cycle completes. This is a firmware interpretation issue, not a fault with the replacement cell. Run one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100% — the health warning clears after that cycle resets the BIOS battery data.

Tecra 8200 shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC hasn't yet calibrated its model against the new cell's actual discharge curve. The displayed percentage and the real remaining capacity are out of sync, so the BIOS hits its low-voltage protection threshold while the OS still shows capacity remaining. It is not a defective cell. Run two to three full discharge-to-hibernate then charge-to-100% cycles — by the third cycle the fuel gauge IC recalibrates and the shutdown point aligns with what the screen shows.