About this replacement
Samsung NP-530 Series — 7.4V Li-Polymer Replacement Battery (AA-PBYN4AB)
This is a 7.4V, 6000mAh (44.4Wh) lithium-polymer replacement battery for Samsung NP-530 series notebook computers. It fits the NP-530U3B-A01, NP-530U3B-A02, NP-530U3B-A04, and over 57 additional NP-530 variants using OEM part numbers AA-PBYN4AB and AA-PLWN4AB. Swap it in when the original cell no longer holds charge or the laptop has stopped running on battery power.
- NP-530U3B platform fit: All NP-530U3B variants share the same 7.4V two-cell Li-Polymer pack architecture, the same 273.60 × 117.04 × 5.43mm footprint, and the same five-pin BMS connector. One SKU covers the full lineup because the battery management handshake and physical form factor are identical across every sub-model.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on NP-530U3B hardware. The BMS communicated correctly with the Samsung EC firmware, charge current tapered properly at the top-of-charge threshold, and cell balance held within spec across multiple cycles.
- Post-install calibration on the NP-530: After fitting this battery, run a full discharge until the laptop hibernates, then charge uninterrupted to 100%. This single cycle resets the BIOS battery learn sequence on the NP-530 and clears the inaccurate health warning that appears whenever the original EEPROM data no longer matches the new cell's chemistry profile.
Why the NP-530 BIOS reports poor battery health after a cell swap
Samsung's EC firmware on the NP-530 reads cycle count, charge history, and rated capacity from the battery's EEPROM. When a new cell ships, that EEPROM contains factory defaults that do not match the usage history the BIOS expects from the installed pack. The firmware interprets the mismatch as a degraded cell and flags it as poor health. Running a full discharge-to-hibernate followed by a full uninterrupted charge gives the BIOS one complete learn cycle against real cell data and clears the warning. After two to three cycles the fuel gauge IC stabilises and health reporting returns to normal.
NP-530 shutting down at 20–30% remaining after battery replacement
This happens when the fuel gauge IC is still calibrated to the old cell's voltage curve. The new Li-Polymer cell has a steeper voltage cliff below roughly 3.5V per cell — the laptop's load controller hits that cliff before the displayed percentage reaches zero. The gauge reads 25% but the cell voltage has already dropped below the safe discharge threshold under combined CPU and display load. Fix this by running two full discharge-to-hibernate cycles back-to-back, allowing the fuel gauge IC to map the new cell's actual voltage-to-capacity curve. After calibration, shutdown at false percentages stops and the gauge tracks down to the correct 3.0V per-cell cutoff.