About this replacement
Dell Latitude 12 7280 — 11.4V Li-Polymer Replacement Battery (0G74G)
This 11.4V, 3400mAh (38.76Wh) lithium-polymer cell replaces the original battery in the Dell Latitude 12 7280 and several related Latitude 12 series notebooks. It fits the 7280, 7480, 5300, and 7300 models that share the same OEM part numbers 0G74G, 8JYHH, and 2PFPW. Install it when the original cell no longer holds a usable charge or the laptop has stopped running on battery entirely.
- Latitude 12 7000 and 5000 series fit: These models share an identical connector pinout, BMS handshake protocol, and 11.4V three-cell architecture. The BIOS on each reads battery identity data from the same EEPROM register, so the same physical cell satisfies authentication across all listed variants.
- Bench tested on actual hardware: We ran this cell on a Latitude 7280 unit and confirmed the BMS completed a full charge cycle without tripping overcurrent protection. The BIOS recognised the cell and reported capacity within expected tolerance after one complete discharge-recharge cycle.
- Post-install discharge cycle: After fitting this cell, run the laptop on battery until it hibernates at cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after swapping cells in this series.
BIOS reporting battery health as poor immediately after replacement
The Latitude BIOS stores health and cycle-count data in the outgoing cell's EEPROM. When a new cell arrives, that register reads as blank or mismatched, so the BIOS flags it as degraded before a single charge has completed. This is a firmware read issue, not a cell fault. Run one full discharge to hibernate-cutoff followed by a complete uninterrupted charge. After that cycle the BIOS recalibrates and the health warning clears.
Laptop shutting down at 20–30% shown on the gauge
This happens because the fuel gauge IC is still calibrated to the old cell's voltage curve. When the new cell's voltage drops under combined CPU and display load, it crosses the cutoff threshold before the percentage gauge catches up. The laptop interprets that voltage cliff as a dead cell and shuts down. Run two to three full discharge-recharge cycles so the fuel gauge IC maps the new cell's actual voltage profile. After calibration, shutdowns should not occur above 5–8% remaining.