DR36 Laptop Replacement Battery 12V 3800mAh Ni-MH

BSI NB8600 — 12V Ni-MH Replacement Battery (DR36)

This is a 12V, 3800mAh Ni-MH replacement battery for the BSI NB8600 notebook computer. It fits using OEM part numbers DR36 and DR36S. The battery restores cordless operation to the NB8600 when the original cell has degraded past usable capacity.

• NB8600 platform fit: Both DR36 and DR36S share the same 12V rail, physical footprint, and connector pinout on the NB8600. Either part number drops into the same bay — the BMS handshake runs on the same signal lines across both variants.
• Bench tested on actual hardware: We cycled this cell through charge, full load discharge, and BMS communication checks. The protection circuit responded correctly to cutoff thresholds and resumed charging without fault flags at each cycle.
• NB8600 cell conditioning after swap: After installing, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting battery health as poor after installing this cell

The NB8600 BIOS reads health data from EEPROM registers written by the original factory cell. A new cell arrives with its own EEPROM baseline, so the BIOS flags a mismatch as poor health rather than a fault. This is not a defective battery. Run one complete discharge-to-hibernate then a full uninterrupted charge — this forces the BIOS to overwrite the stale EEPROM reference with data from the new cell. After two to three cycles the health status normalises.

NB8600 shutting 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 reads a voltage that maps to 20–30% on the old cell's curve, but the new Ni-MH cell hits its voltage cliff at a different point under combined CPU and display load. The laptop cuts power before the OS can act on the real state of charge. To fix it, run two full discharge-to-hibernate cycles followed by complete charges — after that the fuel gauge IC recalibrates its curve and the shutdowns stop.