About this replacement
Toshiba Satellite 1100 / 1110 Series — 14.8V Li-ion Replacement Battery (PA3209U-1BRS)
This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for the Toshiba Satellite 1100 and 1110 notebook series. It fits the Satellite 1100, 1110, 1100-S101, and 1110-S153, among other models in this lineup. It replaces OEM part PA3209U-1BRS directly.
- Satellite 1100 / 1110 platform fit: These models share the same 14.8V four-cell battery rail, connector pinout, and BMS handshake protocol. Swapping between models in this series works because the charge controller expects the same voltage profile and SMBus communication from the battery pack.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Satellite 1100 chassis. The BMS handshake completed cleanly, the charge controller accepted the pack without flagging an unknown device, and the cell held voltage within spec across the full discharge curve.
- Post-install discharge cycle for Satellite 1100: After fitting this battery, let the laptop run on battery until it hibernates from low charge, then charge it uninterrupted to 100%. The Satellite 1100's BIOS uses this learn cycle to reset its internal capacity estimate against the new cell — skipping it leaves the fuel gauge reading from stale EEPROM data.
BIOS reporting poor battery health immediately after fitting a new cell
The Satellite 1100 BIOS stores battery health data in EEPROM on the old pack. When a new cell goes in, that stored data no longer matches, and the BIOS flags the battery as degraded before it has run a single cycle. This is not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100%. The BIOS recalculates health against the new cell's actual charge curve and clears the warning.
Laptop cuts out at 20–30% charge shown on screen
This happens when the fuel gauge IC still holds calibration data from the original degraded cell. The percentage shown on screen no longer maps accurately to actual remaining cell voltage. Under full CPU and display load, the cell hits its low-voltage cutoff while the OS still shows capacity remaining. Run two to three full discharge-to-hibernate and full-charge cycles to recalibrate the fuel gauge IC against the new cell's actual voltage curve — after that, the cutoff should track correctly down to the configured low-battery threshold near 10.5V per cell.