Daewoo 7550 Replacement Battery DR36 12V 3800mAh Ni-MH

Daewoo 7550 — 12V Ni-MH Replacement Battery (DR36)

This is a 12V, 3800mAh Ni-MH replacement battery for the Daewoo 7550 laptop. It slots into the original battery bay and restores mobile operation when the factory cells have degraded beyond usable capacity. OEM part numbers DR36 and DR36S both apply to this unit.

• Daewoo 7550 compatibility: The 7550 uses a dedicated 12V battery rail with a connector and BMS handshake tied to the DR36 and DR36S part numbers. Both variants share identical voltage, cell count, and connector pinout — this replacement covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS negotiation completes correctly and the laptop's charge controller accepts the cell without throwing a fault or refusing to charge.
• First-cycle conditioning for Ni-MH: Ni-MH cells in laptops benefit from a full uninterrupted charge immediately after installation — do not use the laptop on battery until the first charge reaches 100%. This matters specifically because the Daewoo 7550 BIOS runs a battery learn cycle on first charge, and interrupting it causes the fuel gauge to read incorrectly for weeks.

BIOS reporting battery health as poor immediately after swapping the DR36

The Daewoo 7550 BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell on first boot. A fresh cell has no accumulated cycle data, so the BIOS flags it as unknown or poor. This is not a fault with the replacement — it is a data mismatch. Run one complete charge-to-100% followed by a full discharge to hibernate cutoff, then charge uninterrupted to 100% again. After two full cycles the BIOS recalibrates against the new cell and the health warning clears.

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

This happens when the fuel gauge IC has not yet calibrated to the new cell's discharge curve. The gauge was built around the old cell's data, so it loses track of actual remaining capacity under load — particularly when the CPU and display draw simultaneously. The laptop hits a real voltage floor before the percentage counter catches up, triggering an emergency shutdown. Run two full discharge-to-hibernate cycles with the screen at full brightness and a steady CPU load — by the second cycle the gauge IC realigns to the new chemistry and the cutoff point tracks correctly down to around 10.8V.