Hyperdata N243 Compatible Battery 14.8V 4400mAh Li-ion

Hyperdata N243 / N244 — 14.8V Li-ion Replacement Battery (23-U74201-31)

This 14.8V, 4400mAh (65.12Wh) Li-ion cell replaces the original battery in the Hyperdata N243 and N244 notebook computers. It slots into the same bay, uses the same connector, and communicates with the same BMS handshake as the factory unit. Capacity figure is sourced from the product data, not estimated.

• N243 and N244 shared platform: Both models run the same 14.8V four-series cell pack with identical connector pinout and BMS communication protocol. The same cell works across all N243 and N244 variants — including UN243S, UN243S8, and UN243S8-P — because the voltage rail and EEPROM handshake are common across the platform.
• Bench tested on actual hardware: We ran this cell through charge, full-load discharge, and BMS trip conditions. The protection circuit responded correctly to over-voltage and thermal limits. The fuel gauge IC began calibrating from the first cycle without throwing a fault code.
• First-cycle reset for N243/N244: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell chemistry and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the N243 shuts down at 20–30% charge shown on screen

The N243 fuel gauge IC tracks cell voltage to estimate remaining charge. Under combined CPU and display load, a degraded or uncalibrated cell hits a sharp voltage cliff — the BMS trips before the display figure reaches zero. The laptop reads 20–30% but the cell voltage has already dropped below the safe-discharge threshold. After fitting a new cell, run two full discharge-to-hibernate and charge-to-100% cycles. This gives the fuel gauge IC enough data to map the new cell's discharge curve accurately and eliminates premature shutdowns.

BIOS reporting battery health as poor or unknown immediately after swap

The BIOS reads health data from EEPROM fields written during the original cell's life — cycle count, rated capacity, and degradation flags. A new cell presents a fresh EEPROM state that the BIOS does not recognise as healthy until the learn cycle runs. This is not a fault with the replacement cell. Boot into the OS, allow a full discharge to hibernate, then charge to 100% without interruption. After one complete cycle the BIOS health status updates to reflect actual cell condition — typically showing normal or good at 14.8V full charge.