About this replacement
Toshiba Satellite Click Mini L9W-B Series — 3.75V Li-Polymer Replacement Battery (A000381560)
This 3.75V 5100mAh (19.13Wh) Li-Polymer cell replaces the original battery in the Toshiba Satellite Click Mini L9W-B 8.9 and its variants, including the L9W-B-100, L9W-B-103, and L9W-B-107. The battery sits inside the detachable display unit — not the keyboard dock. It uses OEM part numbers A000381560, T10TC, and T8T-2.
- L9W-B display unit compatibility: All L9W-B variants share the same 3.75V single-cell architecture, connector pinout, and BMS handshake protocol in the display unit. The keyboard dock carries its own separate power rail and does not interact with this cell.
- Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS communication checks on the L9W-B platform. The BMS handshake completed correctly, charge acceptance reached full capacity, and no fault codes were triggered during the test cycle.
- Post-install learn cycle on the L9W-B: After fitting this cell, run one full discharge until the device hibernates on its own, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
Why the L9W-B BIOS flags a new battery as poor health immediately after swap
The Toshiba BIOS stores battery health data in an EEPROM register tied to the original cell's charge cycle count. When a new cell is fitted, that register still holds the old cell's degraded data. The BIOS reads it and reports poor health even though the new cell is at full capacity. Running one full discharge-to-hibernate then a complete uninterrupted charge resets the learn cycle and allows the BIOS to write fresh calibration data to the register.
Fuel gauge jumping erratically for the first few charge cycles after replacement
The fuel gauge IC on the L9W-B uses coulomb counting calibrated against the original cell's internal resistance profile. A new cell has a different impedance signature, so the IC's charge estimates are inaccurate until it recalibrates. This shows up as the percentage jumping — often skipping from 60% to 15% with no warning. Run two to three full discharge and charge cycles from 100% down to hibernate cutoff, then back to 100%, and the IC will recalibrate against the new cell's actual curve.