About this replacement
Dell Latitude 3340 / 3350 — 11.1V Li-ion Replacement Battery (YFDF9)
This 11.1V 5800mAh Li-ion battery replaces the original cell in the Dell Latitude 3340, Latitude 3350, and Latitude 13 Education series. It covers OEM part numbers YFDF9, VDYR8, HGJW8, 451-BBJB, and related variants. Capacity is 64.38Wh — matching the factory specification for these ultrabook-class notebooks.
- Latitude 3340 / 3350 / 13 Education platform fit: These models share the same 11.1V three-cell architecture, connector pinout, and BMS handshake protocol. One cell covers all listed variants without any hardware modification.
- Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a Latitude 3340. The BMS communicated correctly with the EC, charge current ramped as expected, and the cell reached 100% without triggering a fault or cutoff event.
- BIOS learn cycle after installation: After fitting this cell, run one complete discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Dell notebooks.
BIOS reporting poor battery health immediately after replacement
Dell's EC reads health data from the battery's EEPROM on first contact. When a new cell arrives, its EEPROM does not yet hold cycle history matched to this machine, so the BIOS flags the battery as degraded or unknown. This is a data mismatch, not a hardware fault. Running one full discharge-to-hibernate then a full uninterrupted charge writes fresh cycle data and clears the warning. After two to three cycles, the health status in Dell Power Manager will update to normal.
Laptop shutting down at 20–30% charge shown on screen
This symptom appears when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The IC is still using discharge curves from the old, degraded cell, so it miscalculates the voltage cliff and triggers shutdown early. The fix is straightforward: discharge the laptop fully to hibernate-cutoff twice in succession, charging to 100% between each cycle. After calibration, the OS gauge will track the true cell voltage and shutdowns at false-low percentages will stop. Target a full charge endpoint of 12.6V across the pack.