Dell Latitude E4300 Replacement Battery 11.1V 4400mAh

Dell Latitude E4300 Series — 11.1V Li-ion Replacement Battery (312-0822)

This is an 11.1V, 4400mAh (48.84Wh) Li-ion battery for the Dell Latitude E4300, E4310, E4320, and E4400 notebooks. It replaces OEM part numbers including 312-0822, FM332, FM338, HW905, XX327, and XX337, among others. The cell fits the standard battery bay on all four Latitude models without modification.

• E4300 / E4310 / E4320 / E4400 compatibility: All four Latitude models share the same 11.1V three-cell bus, connector pinout, and SMBus communication protocol. The BMS in this cell speaks the same data handshake Dell's EC expects, so BIOS recognises it as a valid battery rather than flagging an unknown device.
• Bench tested on actual hardware: We ran this cell on an E4300 under combined CPU and display load. The BMS held the voltage rail steady across discharge and tripped thermal protection at the expected threshold — no spurious shutdowns during the test.
• Post-install calibration on Dell Latitude: After fitting this cell, run one full discharge to the 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 these Latitude models.

Laptop shutting down at 20–30% shown on the E4300 and E4400

This happens when the cell voltage drops below the EC's safe-operating threshold before the fuel gauge reads zero. Under a full CPU plus display load, current draw spikes and a degraded or uncalibrated cell hits a voltage cliff — the EC cuts power instantly rather than letting the cell go into an unsafe state. On the E4300 and E4400, this cliff typically appears between 18% and 32% on the Windows battery meter. Running one full discharge-to-hibernate then a clean charge cycle gives the fuel gauge IC enough data to remap the curve correctly.

BIOS reporting new battery health as "poor" immediately after swap

Dell's BIOS reads health status from EEPROM data embedded in the battery's SMBus controller — it does not measure cell condition directly at first boot. When a new cell arrives with factory EEPROM defaults, the BIOS compares those values against the learn-cycle data it stored for the old battery and flags a mismatch as poor health. This is not a fault with the replacement cell. Run the full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%, and the BIOS recalculates health against the new cell's actual charge profile — the warning clears after one or two completed cycles.