Clevo NH58RAQ 14.4V Replacement Battery 6-87-NH50S-41C00

Clevo NH58RAQ Series — 14.4V Li-ion Replacement Battery (6-87-NH50S-41C00)

This is a 14.4V Li-ion replacement battery rated at 2200mAh (31.68Wh), carrying OEM part number 6-87-NH50S-41C00 and NH50BAT-4. It fits the Clevo NH58RAQ alongside a broad range of NH-series laptops including the NH55RGQ, NH70RHQ, and NH58RHQ. Voltage and connector pinout match the original cell exactly.

• NH-series platform fit: These NH-series models share the same 14.4V four-cell architecture, BMS handshake protocol, and battery connector — which is why a single part number covers the full range. The BMS communicates state-of-charge data over the SMBus line, so connector alignment matters as much as voltage.
• Bench tested on actual hardware: We cycled this cell on an NH58RAQ chassis. The BMS accepted the new cell without fault codes, charged to full capacity, and discharged through full CPU and display load without triggering a premature low-voltage cutoff.
• First-cycle calibration after install: After fitting this cell, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The NH-series BIOS reads health data stored in the battery's EEPROM. When a replacement cell is installed, the EEPROM contains factory default values that don't match the learned discharge curve the BIOS previously recorded. The system flags this mismatch as degraded health even though the cell is new. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% lets the BIOS rewrite its battery profile and clears the warning.

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

This happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual discharge curve. The OS reads a state-of-charge percentage based on data from the old cell's profile, so the displayed percentage and the real remaining voltage drift apart. Under full CPU and display load the cell voltage drops faster than the gauge expects, hitting the BMS low-voltage cutoff while the screen still shows 20–30%. Two or three full discharge-and-charge cycles bring the fuel gauge IC back into sync — after that, shutdown should occur below 5% as displayed.