About this replacement
Dell Latitude 7340 / 7350 / 7440 — 7.6V Li-Polymer Replacement Battery (599M7)
This is a 7.6V, 4850mAh (36.86Wh) lithium-polymer cell built to replace the original battery in the Dell Latitude 7340, 7340 2-in-1, 7350, and 7440 series ultrabooks. It matches OEM part numbers 599M7, 76KVG, and FH97R. When the factory cell degrades and the laptop no longer holds a charge off the adapter, this cell restores unplugged operation.
- Latitude 7340 / 7350 / 7440 platform fit: These models share the same 7.6V two-cell Li-Polymer architecture, identical connector pinout, and a compatible BMS handshake protocol — which is why one cell covers the full group. Swapping between these models does not require firmware changes or cable adapters.
- Bench tested on actual hardware: We cycled this cell on a Latitude 7340 under mixed CPU and display load. The BMS held stable communication throughout, charge acceptance was consistent from the first cycle, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
- Post-install calibration on Dell Latitude: After fitting this cell, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity curve and clears the false health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after replacement
Dell's BIOS reads health data from the battery's EEPROM, which still carries state-of-health values written by the old, degraded cell. A new cell arrives with factory EEPROM data that hasn't been calibrated to the system yet, so the BIOS flags it as unknown or poor. This is not a fault with the replacement cell — it is a data mismatch. Running one complete discharge-to-hibernate and a full uninterrupted charge cycle triggers the battery learn cycle and overwrites the stale EEPROM health report with accurate figures.
Laptop shutting down at 20–30% charge shown on screen
This symptom appears when the fuel gauge IC in the system has calibrated itself around the old cell's degraded voltage curve. The new cell hits a voltage cliff under combined CPU and display load at a state-of-charge the gauge still reads as safe — so the system drops out without warning. The fix is calibration: deplete the battery fully to hibernate cutoff, then charge to 100% without interruption. After two to three of these full cycles, the fuel gauge IC recalibrates to the new cell's voltage profile and the percentage readout tracks accurately down to shutdown.