About this replacement
Dell Latitude 7350 — 11.1V Li-Polymer Replacement Battery (271J9)
This 11.1V, 2700mAh Li-Polymer cell replaces the original battery in the Dell Latitude 7350 and Latitude 13 7000 series ultrabooks. It fits the slim 4.60mm battery bay and matches the original connector and BMS handshake. Use the OEM part numbers 271J9, YX81V, GWV47, MN791, and 3WKT0 to confirm fitment before ordering.
- Latitude 7350 and 13 7000 series fitment: These models share the same 11.1V power rail, slim form factor, and Dell BMS communication protocol. The same cell works across CAL001 and CAL007 chassis variants because the connector pinout and charge handshake are identical across the Latitude 13 7000 production run.
- Bench tested on actual hardware: We cycled this cell on a Latitude 7350 and monitored BMS communication at each charge stage. The protection circuit held cutoff at spec voltage under both idle and full CPU-plus-display load conditions.
- BIOS learn cycle after install: After fitting this cell, run the laptop down to hibernate-cutoff on battery alone, then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
Why the Latitude 7350 shuts down at 20–30% after a battery swap
The fuel gauge IC on the Latitude 7350 stores charge-curve data from the old cell in its EEPROM. When a new cell goes in, that stored curve no longer matches actual cell chemistry, so the IC miscalculates the remaining charge. Under full CPU and display load the new cell hits a voltage cliff earlier than the IC expects, and the laptop cuts power before the gauge reaches zero. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the IC enough data to recalibrate against the new cell.
BIOS reporting 0% or "unknown battery" immediately after installation
This happens when the EEPROM on the replacement cell carries different initialisation data than Dell's firmware expects on first handshake. The BIOS flags the battery as unknown rather than displaying a charge percentage. Plug in the AC adapter and leave the system powered on for a full charge cycle without interruption — the BMS re-establishes communication and the BIOS registers the cell correctly. If the status still shows unknown after one full charge, reseat the battery connector and repeat.