About this replacement
Dell Alienware 15 R3 / 17 R4 — 11.4V Li-ion Replacement Battery (01D82)
This is a 11.4V, 8300mAh (94.62Wh) lithium-ion battery for the Dell Alienware 15 R3 and Alienware 17 R4 series gaming laptops. It replaces OEM part numbers 01D82, 9NJM1, 0HF250, and 0MG2YH. The cell fits the full chassis including ALW17C-D1748, ALW17C-D1758, and over 70 additional variants.
- Alienware 15 R3 and 17 R4 platform compatibility: Both chassis share the same 11.4V three-cell architecture, connector pinout, and BMS handshake protocol — one cell fits both without modification or adapter.
- Bench tested on actual hardware: We cycled this cell on an Alienware 17 R4 under sustained CPU and GPU load. The BMS held charge cutoff correctly, balanced across cells without tripping protection, and reported accurate state-of-charge to the BIOS throughout.
- Post-install calibration on Alienware systems: After fitting, run the laptop down to hibernate cutoff, then charge uninterrupted to 100%. This completes the BIOS battery learn cycle. Skipping it causes the health indicator to report inaccurate warnings for weeks after installation.
BIOS reporting battery health as poor immediately after replacement
Dell's BIOS reads health data from the battery's EEPROM, which stores cycle count and capacity history from the previous cell. When a new cell is installed, that EEPROM data resets to zero or returns values the BIOS doesn't recognise, triggering a false "poor health" or "unknown battery" warning. This is a firmware calibration issue, not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% — the BIOS battery learn cycle overwrites the stale EEPROM read and clears the warning.
Laptop shutting down at 20–30% charge shown after battery swap
This happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual discharge curve. The gauge was mapped to the old cell's voltage profile, so it misreads the remaining capacity and signals shutdown before the cell is actually depleted. It's not a faulty cell — it's a calibration lag. Run two to three full discharge and charge cycles to let the fuel gauge IC remap to the new cell. After the third cycle, the reported percentage and actual cutoff voltage should align at or below 11.1V.