Dell Latitude 9330 Replacement Battery 11.55V 4100mAh 05Y3T9

Dell Latitude 9330 Series — 11.55V Li-Polymer Replacement Battery (05Y3T9)

This 11.55V, 4100mAh (47.36Wh) Li-Polymer battery replaces the original cell in the Dell Latitude 9330, 9330 2-in-1, 9330 4JG2Y, and 9330 6W5R4. It matches the OEM connector, cell chemistry, and BMS communication protocol the Latitude 9330 platform requires. Fits the slim 267.50 x 98.10 x 4.80mm bay without modification.

• Latitude 9330 platform fit: All 9330 variants share the same voltage rail, physical connector, and BMS handshake logic. The 05Y3T9 part number covers the full range — standard clamshell and 2-in-1 convertible — because Dell used one battery architecture across the lineup.
• Bench tested on actual hardware: We ran this cell through charge, full discharge, and charge cycles on a Latitude 9330 unit. The BMS negotiated correctly with the EC firmware, accepted the full charge curve to 11.55V, and reported cell data back to the OS without error flags.
• Post-install calibration on the Latitude 9330: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting battery health as poor after replacement on the Latitude 9330

The Latitude 9330 BIOS reads health data stored in the old cell's EEPROM and compares it against wear metrics accumulated over its service life. When a new cell is installed, the EC firmware still holds the previous cycle count and charge history until a learn cycle forces it to re-baseline. This is not a fault with the replacement cell — it is a mismatch between stored EEPROM data and the actual new chemistry. Run a full discharge to hibernate-cutoff followed by an uninterrupted charge to 100%; after one or two cycles the BIOS health indicator will update correctly.

Latitude 9330 shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated its discharge curve against the new cell. Under combined CPU and display load, the actual cell voltage drops faster than the uncalibrated gauge predicts, so the laptop hits the low-voltage protection threshold while the OS still shows significant charge remaining. The fix is calibration, not a hardware fault. Discharge the laptop fully to hibernate-cutoff once — do not interrupt it — then charge to 100% without removing power; after two full cycles the fuel gauge IC locks onto the correct discharge profile and the premature shutdown stops.