Dell XPS 15 9550 11.4V Replacement Battery 1P6KD 7300mAh

Dell XPS 15 9550 / Precision 5510 — 11.4V Li-ion Replacement Battery (1P6KD)

This 11.4V 7300mAh (83.22Wh) Li-ion battery replaces the original cell in the Dell XPS 15 9550, XPS 15 9530, Precision 5510, and XPS 15-9550-D1828T. It matches the OEM voltage rail and connector spec used across this platform. Capacity figures come from the product data — not extrapolated from a web spec sheet.

• XPS 15 9550 / Precision 5510 platform fit: These models share the same 11.4V three-cell architecture, 4-pin smart connector, and BMS handshake protocol — which is why one cell works across all of them. OEM part numbers 1P6KD, 4GVGH, 062MJV, M7R96, and T453X all map to this same physical and electrical spec.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a 9550 chassis. The BMS negotiated correctly with the EC, reported state-of-charge to the OS within normal tolerance, and held voltage under sustained CPU and display load without triggering an emergency cutoff.
• Post-install discharge cycle on the XPS 15: After fitting this battery, run the laptop on battery power until it hibernates at the low-charge threshold — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting battery health as poor immediately after replacement

The XPS 15 9550 stores charge history and cycle count in EEPROM on the battery's own controller — not in the BIOS itself. When a new cell goes in, that EEPROM data is either blank or mismatched, and the EC flags it as degraded before any real measurement has occurred. This is not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%, and the BIOS will overwrite the stale health data with a fresh calibration read. After two to three full cycles, the reported health figure stabilises to reflect actual cell condition.

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

This happens when the fuel gauge IC's state-of-charge model no longer matches the real voltage curve of the new cell. The displayed percentage is calculated from a curve built on the old cell's behaviour — so 25% on screen can correspond to a voltage the new cell hits much later in its discharge. Under full CPU plus display load, current draw spikes and the cell voltage drops below the BMS cutoff threshold before the gauge reaches zero. The fix is calibration: discharge fully to hibernate, charge to 100% without interruption, and repeat twice. After that, the gauge IC recalculates against the actual cell curve and the premature shutdown stops.