About this replacement
Dell Latitude E5550 — 7.4V Li-Polymer Replacement Battery (G5M10)
This is a 7.4V, 6850mAh (50.69Wh) lithium-polymer battery for the Dell Latitude E5550 and Latitude 15 5000 series 15.6-inch business notebooks. It replaces OEM part numbers G5M10, 8V5GX, 6MT4T, F5WW5, and over a dozen additional Dell cross-references. Connector, BMS handshake, and physical dimensions match the original tray exactly.
- Latitude E5550 and E5450 compatibility: Both the E5550 and E5450 share the same 7.4V two-cell battery rail, identical battery bay dimensions, and the same EC firmware BMS handshake — that's why one part number spans both platforms.
- Bench tested on actual hardware: We ran this cell on an E5550 and confirmed the BIOS accepted it without an unknown-device flag, the charge controller stepped through all three charge phases correctly, and the fuel gauge IC registered the full 50.69Wh rating within two cycles.
- Post-install discharge cycle on the E5550: After fitting this battery, run one full discharge until the laptop hibernates on its own, then charge uninterrupted to 100%. This forces the Dell battery learn cycle to reset against the new cell and clears the inaccurate "poor health" warning the BIOS posts after every cell swap.
BIOS reporting battery health as poor immediately after replacement
The Dell EC firmware stores battery health data from the previous cell in EEPROM and compares it against the new cell's reported state on first boot. A fresh cell with zero discharge cycles reads differently than the worn profile stored — the BIOS flags this as degraded health, not a fault in the new battery. Running the battery learn cycle (full discharge to hibernate cutoff, then a full uninterrupted charge) rewrites the stored profile. After one complete cycle, the health indicator should return to normal.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC is still calibrated to the old cell's voltage-to-capacity curve. The gauge reports 25% remaining, but the actual cell voltage has already dropped below the EC's cutoff threshold under combined CPU and display load. It's not a faulty battery — the IC needs recalibration cycles against the new cell chemistry. Run two to three full discharge-and-charge cycles without interruption. After the third cycle the gauge stabilises and shutdowns at false-low percentages stop. Check the battery tab in Dell Power Manager — the reported Wh should read close to 50.69Wh once calibration completes.