About this replacement
Toshiba Libretto 100CS / Libretto 30 Series — 10.8V Li-ion Replacement Battery (PA2452)
This is a 10.8V, 3000mAh (32.4Wh) Li-ion battery for the Toshiba Libretto subnotebook line. It covers the Libretto 100CS, Libretto 20, Libretto 20CT, Libretto 30, and several additional Libretto variants sharing the PA2452 and PA2497 part number family. If your Libretto no longer holds a charge or shows a flat-dead reading, this cell replaces the degraded original pack directly.
- Libretto series compatibility: The Libretto 20 through 100CS models share the same battery bay dimensions, connector pinout, and 10.8V nominal rail. The PA2452, PA2452U, PA2452UJ, PA2452UR, PA2497, PA2497U, PA2497UR, PA2498, and PA2498U part numbers all cross-reference to this same physical pack. One cell fits the full range.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on compatible Libretto hardware. The BMS held voltage within spec across the full discharge curve and did not trigger an early cutoff during sustained CPU and display load.
- Post-install calibration on the Libretto: After fitting the new cell, run the Libretto down to hibernate-cutoff under normal use — do not force it off — then charge uninterrupted to 100%. The Libretto's BIOS battery learn cycle needs this full pass to recalibrate against the new cell and stop reporting a false health warning on the power status screen.
BIOS reporting battery health as poor immediately after fitting a new cell
The Libretto's BIOS reads health data from EEPROM stored on the old battery pack. When a new cell goes in, that stored data does not match the fresh chemistry, so the BIOS flags it as degraded — even on a brand-new battery. This is not a fault with the replacement cell. Run one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100%. After one to two cycles, the BIOS recalibrates and the health warning clears.
Libretto shutting down at 20–30% charge shown on the power indicator
The Libretto's fuel gauge IC was calibrated against the original cell's discharge curve. With a new cell installed, the IC's internal model drifts — it reads 25% but the actual cell voltage is already at or near cutoff under load. The shutdown is real; the percentage shown is wrong. Run two to three full discharge-to-hibernate and full-charge cycles. After calibration settles, the displayed percentage and actual remaining capacity align, and the early shutdown stops.