Dell XPS 18 D10H3 Replacement Battery 14.8V 4600mAh

Dell XPS 18 1810 / 1820 — 14.8V Li-Polymer Replacement Battery (D10H3)

This is a 14.8V, 4600mAh (68.08Wh) Li-Polymer replacement battery for the Dell XPS 18 convertible. It fits the XPS 18-1810 and XPS 18-1820 and cross-references OEM part numbers D10H3, 4DV4C, and 63FK6. The connector pinout and BMS handshake match the original Dell specification.

• XPS 18 1810 and 1820 compatibility: Both models run the same 14.8V power rail and use the same multi-pin BMS connector. The fuel gauge IC in each talks to the same EEPROM data structure, so one cell works across the full XPS 18 lineup without modification.
• Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS handshake verification on the XPS 18 platform. The BMS accepted authentication on first contact, reported state-of-charge correctly, and thermal cutoff thresholds stayed within Dell spec under sustained load.
• First-cycle recalibration on the XPS 18: After installing, run one full discharge until the system hibernates on its own, then charge uninterrupted to 100%. This forces a BIOS battery learn cycle and clears the inaccurate health warning that appears in Dell Power Manager after every cell swap.

BIOS reporting poor battery health immediately after replacement

Dell's BIOS reads health data from EEPROM registers on the battery controller, not from live cell measurements. When a new cell goes in, those registers are blank or mismatched, and the BIOS flags the battery as degraded before it has ever been cycled. This is a data state issue, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites the learn cycle values. After two to three cycles, Dell Power Manager should report health as normal.

XPS 18 shutting down abruptly at 20–30% charge shown

The fuel gauge IC estimates remaining capacity based on calibration data from previous discharge curves. After a cell swap, that data reflects the old cell's chemistry, not the new one's. The result is a mismatch between the displayed percentage and real cell voltage — the system shows 25% but the cell has already hit the low-voltage cutoff under full CPU and display load. The fix is the same learn cycle: drain to hibernate, then charge to 100% without interruption. After two full cycles, the fuel gauge recalibrates to the new cell's actual voltage curve.