Dell Vostro 3400 Replacement Battery 11.1V 4400mAh 04D3C

Dell Vostro 3400 / 3500 / 3700 — 11.1V Li-ion Replacement Battery (04D3C)

This is an 11.1V, 4400mAh (48.84Wh) lithium-ion battery for the Dell Vostro 3400, 3500, and 3700 laptops. It replaces OEM part numbers 04D3C, 04GN0G, 0TXWRR, 312-0997, 312-0998, JK6R, 7FJ92, CYDWV, Y5XF9, and TY3P4. Use it when the original cell no longer holds adequate charge or fails to register in the BIOS.

• Vostro 3400 / 3500 / 3700 fit: All three models share the same 11.1V three-cell battery bay, connector pinout, and BMS handshake protocol. The same EEPROM data structure is read by each platform's EC firmware, so the cell registers correctly across the series without any hardware modification.
• Bench tested on actual hardware: We ran this cell on a Vostro 3400 under combined CPU and display load. The BMS held stable voltage throughout the discharge curve and communicated accurate state-of-charge data back to the system. No false low-battery shutdowns occurred during testing.
• BIOS learn cycle after install: After fitting this battery, run a full discharge to hibernate-cutoff, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on the Vostro platform.

Laptop shutting down at 20–30% remaining after battery swap

After a cell replacement, the Vostro's fuel gauge IC still references calibration data from the old battery. Under combined CPU stress and full display brightness, the new cell's actual voltage drops faster than the IC predicts. The firmware interprets the sudden voltage sag as a critical low-battery condition and forces an immediate shutdown — even though the display shows 20–30% remaining. Two full discharge-to-hibernate and uninterrupted charge cycles recalibrate the IC against the new cell's chemistry. After calibration, the shutdown threshold should realign to the correct cutoff near 5–8% state-of-charge.

BIOS reporting battery Wh as incorrect after fitting a new cell

The Wh value shown in Dell's BIOS battery information screen is read from EEPROM data embedded in the battery pack's fuel gauge IC, not calculated in real time from cell voltage. A freshly manufactured replacement cell ships with EEPROM values set at the factory, which may differ slightly from the rated 48.84Wh shown in Dell's original system records. This is a data mismatch, not a capacity fault. The reported Wh figure will self-correct after two full calibration cycles as the fuel gauge IC updates its internal register against measured charge throughput.