About this replacement
Toshiba Portégé X30T-E-113 — 7.7V Li-Polymer Replacement Battery (PA5325U-1BRS)
This is a 7.7V, 4550mAh (35.04Wh) lithium-polymer replacement battery for the Toshiba Portégé X30T-E-113 and related X30T-E series ultrabooks. It uses OEM part number PA5325U-1BRS and fits the slim chassis of the X30 and X30T line. Install it when the original cell no longer holds a useful charge or fails to register correctly in the BIOS.
- X30T-E series compatibility: The Portégé X30, X30T-E-10Q, X30T-E-113, and X30T-E-176 all share the same 7.7V battery rail, connector pinout, and BMS handshake protocol — which is why PA5325U-1BRS fits each variant without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the X30T platform. The BMS handshake initialised correctly, the BIOS recognised the pack without errors, and the protection circuit responded at expected voltage thresholds.
- Post-install calibration on the X30T-E: After fitting this battery, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap on this platform.
BIOS reporting poor battery health immediately after fitting the PA5325U-1BRS
The Portégé X30T-E stores battery health data in EEPROM on the original pack. When a new cell is installed, the BIOS reads no accumulated cycle history and flags the pack as degraded or unknown. This is not a fault with the replacement cell — it is the BIOS interpreting missing EEPROM data as damage. Run one full discharge-to-hibernate followed by a complete uninterrupted charge. After two to three full cycles, the BIOS battery learn routine overwrites the stale health flag and the status normalises.
Portégé X30T-E shutting down at 20–30% charge remaining
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The gauge carries over voltage-to-capacity mappings from the old, degraded cell and miscalculates the remaining charge. Under combined CPU and display load, the laptop hits a voltage cliff the gauge did not predict and shuts down. Let the battery discharge fully to hibernation once — the fuel gauge IC resets its reference point and the reported percentage tracks accurately from that point forward. After calibration, the cutoff aligns with the cell's actual lower voltage limit near 2.5V per cell.