About this replacement
Acer Nitro 14 AN14-41 Series — 15.48V Li-Polymer Replacement Battery (AP21B7Q)
This is a 15.48V, 4900mAh (75.85Wh) Li-Polymer battery for the Acer Nitro 14 AN14-41 gaming laptop. It replaces OEM part numbers AP21B7Q and KT.00407.014. Fits the AN14-41-R0CD, AN14-41-R0KZ, AN14-41-R28G, and over 180 additional AN14-41 configurations.
- AN14-41 platform fit: Every AN14-41 variant runs the same 15.48V four-cell Li-Polymer pack with a shared BMS connector pinout. The charge controller and fuel gauge IC on the motherboard communicate through the same EEPROM handshake across the entire lineup, so one cell SKU covers all configurations.
- Bench tested on actual hardware: We cycled this cell on an AN14-41 board under full CPU and GPU load. The BMS held voltage across sustained draw without triggering low-voltage cutoff, and charge termination landed cleanly at 100% through the standard AC adapter.
- Post-install calibration on the Nitro 14: After fitting this cell, run the laptop down to hibernate cutoff under normal use, then charge uninterrupted to 100%. This forces the fuel gauge IC to re-map against the new cell chemistry and clears the inaccurate health warning the BIOS throws after every cell swap.
BIOS reporting battery health as poor immediately after installing a new cell
The Nitro 14 stores battery health data in an EEPROM on the old cell. When you swap the cell, the BIOS reads no matching EEPROM history and flags the new battery as degraded or unknown. This is not a fault with the replacement — it is a data mismatch. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% re-initialises the learn cycle. After two or three full cycles, the BIOS health reading stabilises and clears.
Laptop shutting down at 20–30% charge shown on the gauge
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The gauge was mapped to the old, degraded cell, so it misreads the remaining capacity and triggers a low-battery shutdown well above true empty. Force the laptop into hibernate by letting it discharge fully without interruption — do not plug in at 20%. After one complete discharge-to-hibernate and a full charge back to 100%, the fuel gauge re-anchors its zero-point to the new cell. The phantom shutdowns stop after one to three calibration cycles.