Mifcom EG5 i7-GTX 1660 Ti Compatible Battery 14.6V 2750mAh

Mifcom EG5 i7-GTX 1660 Ti (NH55RCQ) — 14.6V Li-ion Replacement Battery

This is a 14.6V, 2750mAh (40.15Wh) Li-ion replacement battery for the Mifcom EG5 i7-GTX 1660 Ti laptop, identified by chassis code NH55RCQ. It restores portable power to the system when the original cell has degraded past usable capacity. Voltage and connector match the NH55RCQ platform directly.

• NH55RCQ platform fit: The NH55RCQ chassis uses a 4-cell 14.6V architecture with a specific BMS handshake tied to that cell configuration. Swapping to a mismatched voltage rail — even by 0.4V — causes the BMS to reject the pack entirely. This cell matches that rail.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the NH55RCQ board. The BMS accepted the cell, charge current ramped correctly through CC and CV phases, and the protection circuit tripped at the expected cutoff voltage under load.
• Post-install calibration on the EG5: After fitting this battery, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell data and clears the inaccurate health warning that appears after every cell swap on this chassis.

BIOS reporting battery health as poor after fitting the new cell

The NH55RCQ BIOS reads health data from EEPROM registers written by the original factory cell. When a new cell is installed, those registers no longer match the actual chemistry, so the system flags the battery as degraded even though it is brand new. This is a firmware calibration issue, not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% to trigger the learn cycle. After one or two full cycles the BIOS health reading will update correctly.

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

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge reports 20–30% remaining, but the cell voltage has already dropped below the threshold the system needs to sustain the GTX 1660 Ti and the CPU under simultaneous load. The display and GPU together draw sharply more current than idle, and the cell hits its voltage cliff faster than the uncalibrated gauge expects. Run two full discharge-to-hibernate and full recharge cycles — after that, the gauge IC maps the new cell's curve accurately and the premature shutdowns stop.