About this replacement
Dell XPS 15 9500 — 11.4V Li-Polymer Replacement Battery (8FCTC)
This 11.4V, 4550mAh (51.87Wh) Li-Polymer battery replaces the original cell in the Dell XPS 15 9500 ultrabook. It fits the XPS 15-9500-R1845TS, XPS 15-9500-R1505S, and XPS 15-9500-R1845S, among other 9500 variants. OEM part numbers covered include 8FCTC, DVG8M, and P8P1P.
- XPS 15 9500 platform fit: All XPS 15 9500 variants share the same 11.4V three-cell bus, physical connector pinout, and BMS handshake protocol — that's why one cell covers the full model range rather than each SKU needing its own pack.
- Bench tested on actual hardware: We ran this cell on the XPS 15 9500 board. The BMS initialised cleanly, Windows reported voltage correctly within two minutes of boot, and charge cycling held within expected tolerance across repeated full-cycle tests.
- Post-install calibration — XPS 15 9500 specific: After fitting, run the laptop down to hibernate cutoff on battery power, 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 on the 9500 platform.
BIOS reporting poor battery health immediately after fitting a new cell
The XPS 15 9500 BIOS reads health data from the EEPROM embedded in the battery pack — not from the cell voltage itself. When a new cell is installed, the BIOS compares the new pack's EEPROM data against its stored learn cycle history from the old cell and flags a mismatch as poor health. This is a calibration state, not a fault. Run one full discharge to hibernate cutoff followed by an uninterrupted charge to 100%, and the BIOS learn cycle will rewrite against the new cell's actual characteristics.
Laptop shuts off at 20–30% charge shown on the XPS 15 9500
This happens when the cell hits a voltage cliff under combined CPU and display load before the fuel gauge IC reaches zero. The fuel gauge is still reading a calibrated curve from the old, degraded cell — it doesn't yet know where the new cell's actual low-voltage cutoff sits. The result is an abrupt shutdown that looks like battery failure but is a calibration lag. Run two full discharge-to-hibernate, charge-to-100% cycles, and the fuel gauge IC will map the new cell's discharge curve correctly — shutdowns at false-high percentages will stop.