About this replacement
Dell Precision M4600 / M6600 Series — 11.1V Li-ion Replacement Battery (0TN1K5)
This 11.1V, 4400mAh (48.84Wh) Li-ion cell replaces the original battery in the Dell Precision M4600, M4700, M6600, and M6800 mobile workstations. It uses the same connector and BMS handshake as the OEM unit. Cross-reference part numbers include FV993, PG6RC, R7PND, 312-1176, and 97KRM among others.
- M4600 / M4700 / M6600 / M6800 platform fit: These four workstations share the same 11.1V battery rail, physical bay dimensions, and SMBus communication protocol — which is why one cell covers all of them. The BMS talks to the same Dell EC firmware across the range.
- Bench tested on actual hardware: We ran this cell on an M4600 and M6600 chassis. The BMS completed the authentication handshake without flags, charge current ramped correctly through CC and CV phases, and the protection circuit tripped cleanly at the low-voltage cutoff threshold.
- Post-install discharge cycle on Dell workstations: After fitting this cell, run one full discharge to hibernate cutoff, 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
Dell Precision BIOS reads health data from the battery's EEPROM — not from live cell measurements. When a new cell arrives, the EEPROM carries factory-default data that the Dell EC interprets as degraded. This is not a fault with the new battery. Run one full discharge-to-hibernate cycle, then a full uninterrupted charge. The BIOS learn cycle rewrites the health register against the new cell's actual charge curve, and the warning clears.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's chemistry. The displayed percentage drifts from actual cell voltage, so the laptop hits the low-voltage hardware cutoff while the OS still shows charge remaining. It is not a faulty battery. Run two to three full discharge-to-charge cycles without interruption. After the third cycle the fuel gauge IC recalibrates and the reported percentage will track accurately — cutoff should align with a cell voltage of approximately 9.0V.