About this replacement
Dell Inspiron 13 5000 / 7000 Series — 11.4V Li-ion Replacement Battery (WDX0R)
This 11.4V, 3650mAh (41.61Wh) Li-ion battery replaces the original WDX0R cell in Dell Inspiron 13 and 14 series laptops, including the INS 13MF PRO-D1508TS, Inspiron 13 7368, and Inspiron 14-5488. It connects via the same three-cell configuration and BMS handshake as the factory unit. Drop it in and the laptop powers on — no firmware flash needed.
- Inspiron 13 / 14 platform fit: These models share the same 11.4V three-cell rail, identical connector pinout, and WDX0R BMS protocol. That common spec is why one cell covers the full range — the BIOS reads the same EEPROM table regardless of which Inspiron variant is on the bench.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an Inspiron 13 7368. The BMS communicated correctly with the Dell EC, charge termination triggered at capacity, and the OS reported state-of-charge without error flags after two calibration cycles.
- Post-install calibration tip: After fitting this cell, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears on the first boot after any cell swap.
BIOS reporting battery health as poor immediately after replacement
Dell's embedded controller reads health data from the battery's EEPROM — not from a live capacity measurement on first boot. The old cell's degraded values are cached in the BIOS until a learn cycle runs against the new cell. This is not a fault with the replacement. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100%, and the EC re-writes the health register. After that cycle the BIOS should report the cell at or above 95% health.
Laptop shutting down at 20–30% remaining after battery swap
The fuel gauge IC on the motherboard was calibrated against the old cell's voltage curve. With a new cell installed, the gauge can misread remaining charge — reporting 25% while the actual cell voltage has already hit the low-voltage cutoff under CPU and display load. The system shuts down because the cell cannot sustain the voltage rail, not because the battery is faulty. Two full calibration cycles — discharge to hibernate, charge to 100% without interruption — re-map the fuel gauge to the new cell's curve. If shutdown still occurs below 15% after three cycles, check that BIOS battery care mode is not capping discharge at a higher floor.