About this replacement
Dell Latitude E7440 / E7450 — 7.4V Li-Polymer Replacement Battery (F38HT)
This 7.4V, 6080mAh (44.99Wh) lithium-polymer cell replaces the original battery in the Dell Latitude E7440, E7450, Latitude 14 7000, and E7440 Touch. It slots into the same internal bay and connects to the same BMS interface as the OEM unit. Part numbers F38HT, 451-BBFT, PFXCR, T19VW, 34GKR, and several others cross-reference to this same cell.
- E7440 and E7450 platform compatibility: Both models share the same 7.4V two-cell Li-Polymer architecture, identical connector pinout, and the same EC firmware battery handshake — which is why one cell covers the full range.
- Bench tested on actual hardware: We ran this cell on a Latitude E7440 and confirmed the BMS handshake completed without fault codes, the charge circuit accepted current from cold, and the fuel gauge IC began calibration on the first cycle.
- BIOS learn cycle after install: After fitting this cell, run the laptop on battery alone until it hibernates at low charge, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate "poor health" warning that appears after every cell swap on this platform.
Why the E7440 BIOS reports a new battery as poor health or unknown
The E7440 embeds rated Wh and cycle count data in EEPROM on the old cell. When a new cell goes in, the BIOS reads no matching EEPROM history and flags the battery as degraded or unrecognised. This is a firmware behaviour, not a fault with the replacement cell. Running one full discharge-to-hibernate cycle followed by a full uninterrupted charge gives the EC enough data to rewrite its health estimate. After two to three cycles the BIOS health indicator normalises.
Laptop shuts down at 20–30% shown on the fuel gauge
This happens because the fuel gauge IC is still calibrated against the old cell's discharge curve. Under combined CPU and display load, voltage drops faster than the uncalibrated gauge expects — the cell hits the BMS low-voltage cutoff before the percentage reaches zero. It is not a defective cell. Force a full discharge to hibernate, then charge to 100% without interruption. After two full cycles the gauge IC recalibrates to the new cell's curve and the early shutdowns stop.