About this replacement
Asus A72 Series — 11.1V Li-ion Replacement Battery (A32-K72)
This is an 11.1V, 4400mAh (48.84Wh) Li-ion battery for the Asus A72 notebook series, including the A72D, A72DR, and A72F. It fits the original A32-K72 slot and connector without modification. OEM part numbers A32-N71, 70-NX01B1000Z, 70-NXH1B1000Z, 70-NZY1B1000Z, and 70-NZYB1000Z all cross-reference to this cell.
- A72 platform fit: The A72 series shares a common battery bay geometry and three-pin SMBus connector across its variants. The BMS communicates charge state and temperature data directly to the Asus EC chip — the physical and electrical interface is identical across A72D, A72DR, and A72F boards.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the A72 platform. The BMS handshake completed without error, the EC recognised the battery immediately, and charge current tapered correctly at the top of the cycle — no runaway charge events or cutoff faults.
- First-cycle conditioning on the A72: After fitting this cell, run the laptop on battery until it hits hibernate cutoff — do not plug in early. Then charge uninterrupted to 100%. This forces the Asus EC to complete a full battery learn cycle and clears the inaccurate health warning that appears in BIOS after any cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The Asus A72 EC reads EEPROM data stored on the previous cell and compares it against incoming charge cycles. A new cell has no usage history, so the EC flags it as degraded by default. This is a firmware behaviour, not a fault with the replacement. Running one complete discharge-to-hibernate followed by an uninterrupted full charge resets the learn cycle and updates the health register. After two to three full cycles the BIOS health indicator returns to normal.
Laptop shuts down abruptly while the OS gauge still shows 20–25% charge
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The IC is still using the discharge profile from the old, degraded cell — so the percentage readout and the real cell voltage fall out of sync. Under full CPU and display load the cell voltage drops sharply past the BMS cutoff threshold before the gauge reaches zero. Run two full discharge-to-hibernate cycles without interruption and the fuel gauge IC will re-map its curve to the new cell, closing the gap between reported and actual charge state.