About this replacement
Samsung Galaxy Book NP750XDA / NP930SBE Series — 15.4V Li-Polymer Replacement Battery (AA-PBSN4AF)
This is a 15.4V, 3500mAh (53.9Wh) Li-Polymer replacement battery for the Samsung Galaxy Book NP750XDA-KD1IT and related Galaxy Book and Galaxy Book Flex Alpha models. It fits the thin convertible form factor and matches the OEM connector and BMS protocol for that platform. Install it when the original cell can no longer hold a charge across a full work session.
- NP750XDA, NT930SBE, NP930SBE, and NP730QCJ platform fit: These models share the same 15.4V battery rail, AA-PBSN4AF connector pinout, and BMS handshake protocol. A single cell revision covers the full lineup without rewiring or adapter changes.
- Bench tested on actual hardware: We cycled this cell on the NP750XDA platform and confirmed the BMS accepted the new cell without triggering an overcurrent fault. Charge current ramped normally through CC and CV phases, and the fuel gauge IC registered cell capacity without error.
- Post-install calibration for Galaxy Book: After fitting this cell, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after swap on Galaxy Book
The Galaxy Book BIOS reads health data stored in the outgoing cell's EEPROM before shutdown. When a new cell arrives with a fresh EEPROM, the firmware has no prior charge history to compare against and flags the battery as degraded. This is a data mismatch, not a fault with the replacement cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% writes new baseline data and clears the warning on the next boot.
Galaxy Book shuts down hard at 20–30% shown on the gauge
This happens when the fuel gauge IC has not yet calibrated its empty-voltage threshold against the new cell's chemistry. Under combined CPU and display load, the cell voltage drops faster than the uncalibrated gauge expects, and the system hits a low-voltage cutoff the gauge didn't predict. The laptop cuts power to protect the cell even though the reported percentage still shows charge remaining. Run two full discharge-to-hibernate and full recharge cycles — after the second cycle the gauge threshold typically settles and the early shutdowns stop.