About this replacement
Toshiba Portege 3440CT / 3410CT Series — 10.8V Li-ion Replacement Battery (PA2467)
This 10.8V, 3000mAh Li-ion battery replaces the original cell in the Toshiba Portege 3440CT, 3410CT, 3490, 3430, and eight additional Portege models. It uses OEM part numbers PA2467, PA3038U-1BAL, and PA3038U-1BRL, so fitment across this ultraportable lineup is direct. Capacity is 32.4Wh, matching the original specification for these early-2000s business notebooks.
- Portege 3400-series platform compatibility: These models share the same battery bay dimensions, 10.8V power rail, and connector pinout. The BMS handshake protocol is identical across the group, so the EEPROM data transfers cleanly without triggering a fault code on install.
- Bench tested on actual hardware: We cycled this cell on a Portege 3440CT unit and monitored BMS cutoff behaviour at both ends of the voltage curve. The cell held within spec at full charge and cut off cleanly at the low-voltage threshold without tripping a false fault state.
- First-cycle calibration on the Portege: After installing, run one full discharge until the laptop hibernates on low battery, then charge uninterrupted to 100%. The Portege BIOS uses a battery learn cycle to establish capacity baseline — skipping this step leaves the fuel gauge reading stale data from the old cell and will trigger inaccurate health warnings in subsequent boots.
BIOS reporting poor battery health immediately after replacement
The Portege 3440CT BIOS reads health data stored in the battery's EEPROM. When a new cell arrives, that EEPROM holds factory defaults, not learned cycle data — the BIOS interprets this as a degraded or unknown cell and flags it as poor health. This is a data mismatch, not a hardware fault. Running one complete discharge-to-hibernate followed by a full uninterrupted charge allows the BIOS to rewrite the learned capacity baseline and clear the warning on the next boot.
Laptop shuts down at 20–30% charge shown on the fuel gauge
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge maps percentage to voltage using data from the previous cell — on a fresh replacement, those reference points are wrong, so the displayed percentage drops faster than the real state of charge. The laptop hits the BIOS low-voltage shutdown threshold while the gauge still shows 20–30% remaining. Run two to three full discharge-and-charge cycles and the IC recalibrates; the cutoff point should stabilise at or below 10% displayed. If shutdown still occurs above 15% after three cycles, check the BIOS battery report for a resting voltage below 10.5V under load.