Magitronic 620 Replacement Battery 12V 3800mAh DR36

Magitronic 620 / 862 Series — 12V Ni-MH Replacement Battery (DR36)

This is a 12V Ni-MH battery rated at 3800mAh (45.6Wh), built to replace part number DR36 and DR36S. It fits Magitronic notebook models 620, 610, 864, and 862. If your original cell no longer holds charge or the laptop stays tethered to AC power, this is the direct swap.

• 620, 610, 862, and 864 compatibility: These models share the same 12V battery rail, DR36 connector pinout, and BMS handshake protocol — so the same cell works across the entire range without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the 620 platform. The BMS accepted the new cell without rejection flags, charge current ramped normally, and the trickle-charge termination triggered correctly at full capacity.
• First-cycle reset on Ni-MH notebooks: After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. Ni-MH cells in this laptop use a BIOS learn cycle — skipping this step leaves the fuel gauge IC calibrated to the old cell's degraded baseline, causing the health warning to persist after the swap.

BIOS reporting poor battery health immediately after fitting the DR36

The Magitronic 620 BIOS reads health status from EEPROM data written by the previous cell's charge history. When a new cell goes in, that stored data no longer matches actual chemistry state, so the BIOS flags it as poor. This is not a fault with the replacement cell. Running a full discharge-to-hibernate followed by an uninterrupted charge lets the BIOS rewrite its baseline. After one complete learn cycle, the health status corrects itself.

Laptop shuts down with 20–30% still showing on the gauge

This happens when the fuel gauge IC is still calibrated to the old cell's depleted voltage curve. The gauge reads 25% remaining, but the actual cell voltage under full CPU and display load drops below the BMS cutoff threshold — the laptop shuts off immediately. The fix is the same learn cycle: one full discharge to hibernate, one uninterrupted charge to 100%. After two to three cycles, the gauge IC re-maps to the new cell and the cutoff aligns with the displayed percentage. Confirm the BIOS no longer reports a voltage anomaly before relying on the gauge.