Dell Precision 7550 Replacement Battery 11.4V 68ND3

Dell Precision 7550 / 7750 Series — 11.4V Li-ion Replacement Battery (68ND3)

This is an 11.4V, 7850mAh (89.49Wh) lithium-ion battery for the Dell Precision 7550, 7560, 7750, and 7760 mobile workstations. It replaces OEM part numbers 68ND3, 453-BBCQ, CR72X, G5FJ8, J0VNR, PKWVM, and PWKVM. If your Precision is tethered to the wall or shutting down unexpectedly, this cell restores portable operation.

• Precision 7000-series platform fit: The 7550, 7560, 7750, and 7760 share the same 11.4V three-cell architecture, connector pinout, and BMS handshake protocol — which is why a single part number covers all four models. Swapping between these chassis requires no adapter or wiring change.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Precision 7550. The BMS communicated correctly over SMBus, charge termination triggered at the expected voltage, and the pack reached full rated capacity without thermal events.
• Post-install calibration on Precision workstations: After fitting, run the laptop down to hibernate cutoff under a real workload — CAD or video render works well — 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 this platform.

BIOS reporting battery health as poor immediately after replacement

The Precision BIOS stores cycle count, wear level, and design capacity in EEPROM on the battery pack itself. When a new cell arrives, that EEPROM data does not match what the BIOS expects from a "healthy" pack — so it flags poor health even though the cell is new. This is not a fault with the replacement battery. Run one full discharge-to-hibernate then a full uninterrupted charge. The BIOS battery learn cycle rewrites its internal state against the new cell data and the warning clears.

Laptop shuts down abruptly at 20–30% charge shown

The fuel gauge IC on this platform calibrates its state-of-charge curve against the original cell's discharge profile. With a new cell installed, the IC initially maps the wrong voltage-to-capacity relationship — it reports 20–30% remaining at a point where the cell voltage is already near cutoff under the Precision's full CPU and GPU draw. The cell cannot sustain the voltage spike demanded by a heavy render or compile job, so the protection circuit trips and the laptop cuts out. Two to three full discharge and charge cycles recalibrate the fuel gauge IC against the new cell. After that, the reported percentage tracks the actual remaining capacity accurately.