About this replacement
Dell G3 15 / G3 17 Series — 15.2V Li-ion Replacement Battery (07FHHV)
This is a 15.2V, 3400mAh (51.68Wh) Li-ion replacement battery for the Dell G3 15, G3 15 3579, G3 17 3779, and DNCWSCB6106B notebooks. It replaces OEM part numbers 07FHHV, 33YDH, PVHT1, W7NKD, and several others in the same family. The connector pinout and BMS handshake match the original Dell cell spec.
- G3 15 and G3 17 battery platform: These models share a 15.2V four-cell architecture with a common BMS communication protocol over the SMBus line. The EEPROM on this replacement carries the correct chemistry flags, so the Dell EC recognises the cell without triggering an "unknown battery" lockout.
- Bench tested on actual hardware: We ran this cell on a G3 15 3579 unit. The BMS reported state-of-charge within 2% of actual at full charge, and the EC did not throw a battery authentication error during POST or under sustained CPU and GPU load.
- First-cycle calibration on the G3 platform: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears in SupportAssist and Device Manager after every cell swap.
Why the G3 BIOS reports poor battery health immediately after a cell swap
The Dell EC stores charge history and wear data in its own firmware memory, separate from the battery's EEPROM. When a new cell goes in, the EC compares the new cell's reported cycle count against its own stored baseline and flags a mismatch as degraded health. This is a firmware artefact, not a fault with the replacement cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the EC to rewrite its baseline against the new cell. After one or two of these learn cycles, the health reading in SupportAssist returns to normal.
Laptop shuts down at 20–30% remaining shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The old curve stored in firmware predicts a voltage floor that the new cell hits sooner under full CPU and display load, so the system cuts out before the displayed percentage reaches zero. It is not a faulty cell — it is a calibration gap. Run two full discharge-to-hibernate cycles with the display at full brightness and a CPU load active, then charge to 100% each time. After those cycles, the fuel gauge re-anchors to the new cell's real discharge curve and the early shutdown stops. If it persists after three cycles, check that the EC firmware is on the latest Dell BIOS version, as older G3 BIOS builds have a known fuel gauge miscalculation fixed at 15.2V cell voltage.