Clevo DR36 PortaNote 982A Replacement Battery 12V 3800mAh

Clevo PortaNote 982A — 12V Ni-MH Replacement Battery (DR36)

This is a 12V, 3800mAh Ni-MH replacement battery for the Clevo PortaNote 982A and compatible legacy notebook models including the Clevo 96H and Clevo 873 series. It carries OEM part numbers DR36 and DR36S. If the original cell has degraded and the machine no longer holds a charge away from the mains, this cell replaces it directly.

• PortaNote 98 series and Clevo 96H / 873 compatibility: These models share the same 12V battery rail, connector pinout, and BMS handshake protocol — which is why a single part number covers the full group. Voltage tolerance across the platform is tight, and Ni-MH chemistry matches the original charge circuit expectations on all listed units.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on compatible hardware. The BMS accepted the cell without error flags, charge termination triggered correctly at peak delta-V, and the protection circuit cut off cleanly at the low-voltage threshold.
• First-cycle conditioning on Ni-MH systems: After fitting this cell, run one full discharge to the BIOS hibernate cutoff point, then charge uninterrupted to 100%. Ni-MH chemistry on 1990s–2000s laptop charge controllers needs this reset pass to clear the inaccurate health warning that appears after every cell swap and to resync the BIOS battery learn cycle.

BIOS reporting battery health as poor after fitting the DR36

When a new cell goes into a late-1990s Clevo notebook, the BIOS often reads the EEPROM data written by the old, degraded pack. That stored data no longer matches the new cell's actual capacity and internal resistance. The BIOS flags it as poor health because it is comparing live readings against a profile it built around a worn-out battery. Running one full discharge-to-cutoff cycle followed by an uninterrupted full charge forces the BIOS to rewrite that profile against the DR36's actual characteristics and clears the false warning.

Laptop shuts down unexpectedly while the gauge still shows 20–30% remaining

This happens when the cell voltage drops sharply under combined CPU and display load — a voltage cliff that the fuel gauge IC did not predict from the stored discharge curve. On Ni-MH chemistry, this cliff is steeper than the BIOS model expects, particularly if the fuel gauge has not yet calibrated against the new cell. The fix is to run two to three full discharge and charge cycles so the fuel gauge IC can map the actual voltage curve of the DR36. After calibration, the shutoff point and the gauge percentage align, and the premature cutoff stops.