Dell Precision 5680 Replacement Battery 15.4V 4150mAh

Dell Precision 5680 — 15.4V Li-Polymer Replacement Battery (2M0C5)

This is a 15.4V, 4150mAh (63.91Wh) Li-Polymer battery for the Dell Precision 5680 mobile workstation. It replaces OEM part numbers 2M0C5, 9FTVV, F5HR2, and JXM4G. If your original battery no longer holds charge through a full work session, this is the direct cell swap.

• Precision 5680 fitment: The 5680 uses a specific 15.4V four-cell Li-Polymer pack with a multi-pin smart connector. The BMS handshake communicates charge state, health data, and cell voltage directly to the BIOS. Any replacement must match voltage and connector pinout exactly — this cell does both.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Precision 5680 platform. The BMS negotiated correctly, charge current stepped down as expected near full capacity, and no fault codes triggered during the test.
• BIOS learn cycle after install: After fitting this battery, run the laptop down until it hibernates on low battery, 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 Dell Precision hardware.

BIOS reporting battery health as poor immediately after replacement

The Precision 5680 BIOS reads health data from EEPROM registers stored in the old battery's fuel gauge IC. When a new cell goes in, those registers are blank or mismatched. The BIOS interprets the missing data as a degraded battery and flags it as poor health. This is not a fault with the new cell — it is a calibration state. Running one full discharge-to-hibernate followed by a complete uninterrupted charge gives the fuel gauge IC enough data to write accurate figures back to the BIOS.

Laptop shuts down at 20–30% charge shown on the gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The old calibration data predicts a voltage cliff that does not match where this cell actually drops off. The system triggers a shutdown before the battery is genuinely depleted. Two to three full discharge-and-charge cycles let the IC remap the curve to the new cell. After calibration, the gauge should track accurately down to the BIOS cutoff voltage of approximately 12.0V.