Kiwi OpenNote 820 Replacement Battery DR36 12V 3800mAh

Kiwi OpenNote 820 — 12V Ni-MH Replacement Battery (DR36)

This is a 12V, 3800mAh Ni-MH replacement battery for the Kiwi OpenNote 820 notebook computer. It replaces OEM part numbers DR36 and DR36S. Install it when the original cell no longer holds charge and the laptop loses mobility away from AC power.

• OpenNote 820 fitment: The DR36 and DR36S share the same 12V rail, physical form factor, and connector pinout on the OpenNote 820 platform. Both OEM numbers cross to this cell — the battery bay, latch tabs, and BMS handshake are identical across the two part variants.
• Bench tested on actual hardware: We ran this cell through charge, full discharge, and a second full charge cycle on the OpenNote 820. The BMS handshake completed without error, charge accepted cleanly to capacity, and the BIOS registered the pack without flagging an unknown device.
• Ni-MH first-cycle conditioning: After installing, run one full discharge to the laptop's hibernate cutoff, then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every Ni-MH cell swap on this model.

BIOS reporting battery health as poor after swapping the DR36

The OpenNote 820 BIOS reads health data stored in the old cell's EEPROM and compares it against the new pack's charge behaviour. A fresh cell has no accumulated cycle data, so the BIOS flags it as degraded — this is a data mismatch, not a fault. Running one full discharge-to-hibernate followed by an uninterrupted full charge gives the fuel gauge IC enough data to recalibrate. After two to three full cycles, the health indicator corrects itself without any firmware changes.

OpenNote 820 shutting down suddenly while the OS still shows 20–30% charge

This is a voltage cliff common to aged or uncalibrated Ni-MH cells. The fuel gauge IC maps charge percentage using historical voltage curves — when the new cell's curve doesn't match the stored data, the OS percentage reading runs ahead of actual cell voltage. Under combined CPU and display load, the cell voltage drops faster than the gauge predicts and the laptop cuts power before the displayed percentage reaches zero. Force a full calibration cycle: discharge fully to automatic hibernate, then charge to 100% uninterrupted. The gauge IC relearns the voltage curve and shutdown at false percentages stops after one to two calibration passes.