Packard Bell Easy Note K3 14.8V Replacement Battery 4400mAh

Packard Bell EasyNote K3 / K5 Series — 14.8V Li-ion Replacement Battery (442673400015)

This is a 14.8V, 4400mAh (65.12Wh) Li-ion battery for the Packard Bell EasyNote K3, K5, K5266, K5280, and related models. It replaces the original cell pack when capacity has degraded or the battery no longer holds a charge. The physical dimensions are 274 x 48 x 20mm — confirm these against your existing pack before ordering.

• EasyNote K3 / K5 platform fit: These models share the same 14.8V four-cell series configuration, connector pinout, and BMS communication protocol. One cell pack covers the full range without hardware modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on EasyNote K-series hardware. The BMS handshake completed correctly, charge termination triggered at the expected voltage ceiling, and the protection circuit responded to overcurrent conditions as specified.
• First-cycle calibration on the EasyNote K-series: After fitting this cell, run it down until the laptop hibernates, then charge uninterrupted to 100% without using the machine. This gives the BIOS fuel gauge IC a full voltage sweep against the new cell chemistry and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting battery health as poor immediately after fitting a new cell

The EasyNote K-series BIOS stores learned capacity data from the previous cell in EEPROM. When a new cell goes in, the old data is still there — the firmware compares current cell output against those stale figures and flags a health warning. This is not a fault with the new battery. Run one complete discharge-to-hibernate cycle followed by an uninterrupted full charge. After two to three full cycles, the fuel gauge IC recalibrates against the new cell and the health warning clears.

Laptop shuts down abruptly at 20–30% charge shown on screen

This happens when the cell voltage drops below the BIOS cutoff threshold under combined CPU and display load, even though the OS gauge still shows charge remaining. The fuel gauge IC has not yet mapped the new cell's voltage curve, so the percentage readout lags behind actual cell state. The laptop cuts power because the real cell voltage hits the protection floor before the gauge catches up. Run two full calibration cycles — discharge to hibernate, charge to 100% — and the shutdown point will shift back to the correct low-percentage threshold.