About this replacement
Dell Precision 3480 / Latitude 3440 — 11.4V Li-ion Replacement Battery (KDM9P)
This 11.4V, 4600mAh (52.44Wh) lithium-ion battery replaces the original cell in the Dell Precision 3480, Precision 3490, Precision 3590, and Latitude 3440 (2023). It matches the OEM voltage rail and connector used across this generation of Dell compact workstations. Cross-reference OEM part numbers KDM9P, 2X1V9, DR02P, 803W6, or R73TC to confirm fitment before installing.
- Precision 3480 / Precision 3590 / Latitude 3440 platform fit: These models share the same 11.4V three-cell architecture, physical connector pinout, and BMS handshake protocol — which is why one cell covers the full range. The BIOS on each model reads the same EEPROM identifiers from OEM part numbers 2X1V9 and 803W6.
- Bench tested on actual hardware: We ran this cell on a Precision 3480 and cycled it through charge, load, and BMS cutoff. The BMS authenticated correctly at first boot, the fuel gauge IC initialised without error, and the charge controller accepted a full charge to 100% with no fault codes.
- Post-install calibration on Dell Precision hardware: After fitting, run the laptop down to hibernate cutoff on battery only — no AC — then charge uninterrupted to 100%. This gives the BIOS battery learn cycle a clean reference point and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor immediately after replacement
The Precision 3480 stores battery health data in the EEPROM of the original cell. When you swap in a new cell, the BIOS compares live readings against stale EEPROM reference data and flags a mismatch as poor health — even on a brand-new battery. This is a firmware behaviour, not a cell fault. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%. After one to two complete cycles, the BIOS battery learn cycle resets its reference and the health warning clears.
Laptop shutting down at 20–30% charge shown on new battery
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual charge curve. The OS displays a percentage based on the old cell's capacity model, so the reported state of charge and the real voltage diverge. Under combined CPU and display load on the Precision 3480, the cell hits its voltage floor before the gauge reaches 0% — and the system shuts down. Discharge fully to hibernate, recharge to 100%, and repeat twice. After calibration cycles, the gauge tracks accurately and the early shutdowns stop.