Dell Precision M4600 11.1V Replacement Battery 0TN1K5

Dell Precision M4600 / M6800 Series — 11.1V Li-ion Replacement Battery (0TN1K5)

This is an 11.1V 6600mAh (73.26Wh) Li-ion replacement battery for the Dell Precision M4600, M4700, M6600, and M6800 mobile workstations. It uses OEM part number 0TN1K5 and is cross-referenced against a wide range of Dell part numbers including FV993, PG6RC, R7PND, and 97KRM. If your original battery no longer holds a charge or has swollen, this cell replaces it directly.

• Precision M-series compatibility: The M4600, M4700, M6600, and M6800 share the same battery bay dimensions, 11.1V supply rail, and Dell EEPROM handshake protocol. One cell fits all four platforms without modification.
• Bench tested on actual hardware: We ran this cell on a Precision M4600 and confirmed the BMS completed a full charge cycle, reported correct Wh to the BIOS, and held stable voltage under a sustained CPU and GPU load without triggering a low-voltage cutoff.
• First-cycle calibration on the M4600: After installing, run one full discharge until the laptop hibernates, then charge uninterrupted to 100%. This forces the Dell BIOS battery learn cycle to reset against the new cell's EEPROM data and clears the "consider replacing your battery" warning that almost always appears after a cell swap.

BIOS reporting battery health as poor immediately after replacement

The Dell BIOS reads state-of-health data stored in the battery's EEPROM chip, not from live voltage measurements. When a new cell is installed, the BIOS compares its internal charge history against the new cell's EEPROM baseline and flags a mismatch as degraded health. This is a data calibration issue, not a fault with the cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — the BIOS learn cycle then writes a fresh health baseline from the new EEPROM data and the warning clears.

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

This happens when the fuel gauge IC's capacity map no longer matches the actual cell chemistry — common after a battery swap. The OS shows 25% remaining, but the cell voltage has already dropped below the BMS protection threshold under the load of the M4600's Xeon or Core i7 CPU plus the display and storage. The cell cannot sustain the current draw, so the BMS cuts power to prevent damage. Two full calibration cycles — full discharge to hibernate, full uninterrupted recharge — resync the fuel gauge IC to the new cell and shift the shutdown point back to below 5%.