About this replacement
Asus N82 Series — 11.1V Li-ion Replacement Battery (A32-N82 / A42-N82)
This is an 11.1V, 6600mAh (73.26Wh) lithium-ion battery for the Asus N82 series 14-inch notebook. It fits the N82, N82E, N82EI, N82J, and related variants that share the A32-N82 or A42-N82 part number. If the original cell is no longer holding a charge or the laptop dies mid-session, this is the direct swap.
- N82 series compatibility: The N82, N82E, N82EI, and N82J all run the same 11.1V battery rail and use an identical connector and BMS handshake. A single cell covers the range without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on N82 hardware. The BMS communicated correctly with the BIOS, accepted a full charge, and held voltage within spec across the discharge curve without triggering false low-battery cutoff.
- Post-install calibration on the N82: After fitting this cell, run the laptop down to hibernate cutoff, then charge uninterrupted to 100% before using it again. The N82's BIOS uses a battery learn cycle to map the new cell — skipping this step causes the fuel gauge IC to misreport capacity for several weeks.
Why the N82 BIOS flags a new battery as poor health immediately after swap
The N82 BIOS reads health data from the battery's EEPROM, which stores cycle count, rated capacity, and charge history from the previous cell. When a new cell is installed, that EEPROM data starts at factory defaults — the BIOS interprets the mismatch as a degraded or unknown cell and throws a health warning. This is not a fault with the replacement. Running one full discharge-to-hibernate then an uninterrupted charge to 100% triggers the BIOS learn cycle, which overwrites the stale EEPROM read and clears the warning.
N82 shutting down at 20–30% charge shown on screen
This happens when the old or degraded cell can no longer sustain voltage under combined CPU and display load — the cell hits a voltage cliff while the fuel gauge still reads a comfortable percentage. The OS fuel gauge IC calibrates against charge data, not live voltage, so it lags behind actual cell state. A replacement cell with full capacity eliminates the cliff. After fitting, complete two full discharge-to-hibernate and full-charge cycles so the fuel gauge IC re-maps to the new cell's actual voltage curve.