About this replacement
Toshiba Dynabook N514 / Satellite NB10 Series — 11.1V Li-ion Replacement Battery (PA5170U-1BRS)
This 11.1V, 2200mAh Li-ion battery replaces the original cell in the Toshiba Dynabook N514 and Satellite NB10 series notebooks. It carries OEM part numbers PA5170U-1BRS, PA5207U-1BRS, PABAS279, and PABAS282. Rated at 24.42Wh, it fits the connector and bay geometry of the affected models without modification.
- Dynabook N514 and Satellite NB10 platform: These models share the same 11.1V battery rail, three-cell configuration, and locking tab connector. The BMS on each talks to the same BIOS charge controller, so one cell serves the full lineup without electrical or physical conflict.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an NB10-A unit. The BMS communicated correctly with the BIOS, charge termination triggered cleanly at full capacity, and the protection circuit responded to over-discharge cutoff without fault flags.
- First-install calibration on the Dynabook N514: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after fitting a new cell
The Dynabook BIOS reads health data from EEPROM on the battery controller, not from live voltage measurements. When a replacement cell arrives, the EEPROM data does not match the BIOS's stored charge history for the previous pack. This mismatch triggers a "poor health" or "replace battery" flag within the first boot. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% lets the BIOS re-write the learn cycle and clear the flag.
Laptop shuts down abruptly at 20–30% charge shown on the fuel gauge
This happens because the fuel gauge IC was calibrated against the old, degraded cell — not the new one. Under combined CPU and display load, the gauge's voltage-to-capacity curve is wrong, so it fails to predict the voltage cliff and the system cuts power before the displayed percentage reaches zero. The fix is two to three full discharge-and-charge cycles, which allow the fuel gauge IC to remap its curve against the new cell's actual voltage profile. After the third cycle the shutdown point should align with single-digit percentage readings.