AP18L4N Acer TravelMate P614 Compatible Battery 15.2V 3850mAh

Acer TravelMate P614 — 15.2V Li-Polymer Replacement Battery (AP18L4N)

This is a 15.2V, 3850mAh (58.52Wh) Li-Polymer battery for the Acer TravelMate P614 series laptops. It replaces OEM part AP18L4N across a wide range of P614 variants including the TMP614-51, TMP614-51T, and TMP614-51G. It fits the physical tray and uses the same connector and BMS communication protocol as the original cell.

• TravelMate P614 series fit: All P614 variants covered here share the same 15.2V four-cell Li-Polymer architecture, identical connector pinout, and the same BMS handshake that Acer's embedded controller expects. Swapping between sub-models does not require a different cell.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a P614-51 unit. The BMS negotiated charge current correctly, the embedded controller accepted the cell without fault codes, and the protection circuit tripped at the expected low-voltage threshold before hibernate cutoff.
• Post-installation calibration: After fitting, run the laptop down to hibernate on battery — do not plug in early. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap.

Why the TravelMate P614 shuts down at 20–30% after a battery swap

The P614's fuel gauge IC calibrates its state-of-charge map against the original cell's discharge curve. A new cell has a different impedance profile, so the IC's internal model no longer matches actual voltage behaviour under load. When the CPU and display pull full current, voltage drops sharply — faster than the old model predicted — and the system hits an emergency cutoff point before the gauge reads zero. Running two to three full discharge-to-hibernate cycles allows the fuel gauge IC to rebuild its curve against the new cell and eliminates premature shutdowns.

BIOS reporting "poor battery health" immediately after fitting a new AP18L4N cell

Acer's BIOS reads health state from EEPROM data stored in the battery's own management circuit. On a new replacement cell, the EEPROM cycle count and capacity registers may not match what the BIOS expects from a fresh unit, triggering a poor-health flag even though the cell is new. This is an EEPROM data mismatch — not a fault with the cell itself. Run a full battery learn cycle: discharge fully to hibernate, then charge uninterrupted to 100%. After one complete cycle, the BIOS health flag clears and the reported status updates to reflect actual cell condition.