Dell Latitude 5400 Chromebook 11.4V Replacement Battery XV8CJ

Dell Latitude 5400 Chromebook — 11.4V Li-ion Replacement Battery (XV8CJ)

This is an 11.4V, 3500mAh (39.9Wh) Li-ion replacement battery for the Dell Latitude 5400 Chromebook. It also fits the Inspiron 7591 2-in-1, Latitude 5500, and Latitude 5501, among others. OEM part numbers covered include XV8CJ, 27W58, 7VTMN, 1V1XF, and 01V1XF.

• Latitude 5400 Chromebook and cross-platform fit: These models share a common 11.4V three-cell architecture, the same connector pinout, and a BMS handshake protocol that the Dell EC firmware expects on the SMBus. Swapping between these platforms uses the same cell chemistry and capacity rating, so the BIOS accepts the battery without a firmware conflict.
• Bench tested on actual hardware: We ran this cell through charge-discharge cycles on a Latitude 5400 Chromebook unit. The BMS negotiated correctly over SMBus, charge current tapered normally at the CV stage, and the protection circuit tripped at the expected over-discharge threshold without nuisance cutoff under moderate CPU and display load.
• First-cycle reset after installation: After fitting this battery, run a full discharge to hibernate cutoff, then charge uninterrupted to 100%. This forces the Dell BIOS to run its battery learn cycle against the new cell. Skipping this step is the main reason the health warning persists after a swap.

Why the Latitude 5400 Chromebook shuts down at 20–30% after a battery swap

The fuel gauge IC on the Dell system board stores charge-curve data from the old cell in its EEPROM. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. Under full CPU plus display load, the cell voltage drops faster than the old curve predicts, and the BIOS triggers an emergency shutdown well before the true empty point. Running two to three full discharge-to-hibernate-then-full-charge cycles resets the fuel gauge calibration. After calibration, the reported percentage should track actual capacity within a few percent.

BIOS reporting battery health as poor or unknown immediately after installation

The Dell BIOS reads health status from EEPROM data written by the original factory cell — cycle count, rated Wh, and state-of-health flags. A replacement cell resets or presents different EEPROM values, which the BIOS flags as poor or unknown health on the first boot. This is a data mismatch, not a fault with the cell itself. Run the battery learn cycle — full discharge to hibernate, uninterrupted charge to 100% — and recheck health status in Dell SupportAssist or the BIOS battery page.