Dell Latitude E7260 Replacement Battery 11.4V 6400mAh

Dell Latitude E7260 / 7400 2-in-1 — 11.4V Li-Polymer Replacement Battery (02K0CK)

This is an 11.4V, 6400mAh (72.96Wh) Li-Polymer battery for the Dell Latitude E7260 and Latitude 7400 2-in-1 series. It replaces OEM part numbers 02K0CK, 0C76H7, 7146W, DJ5GG, and G8F6M. The physical cell matches the original 313.00 x 131.14 x 8.90mm footprint, so fitment into the chassis is direct.

• E7260 and 7400 2-in-1 compatibility: Both platforms share the same 11.4V three-cell architecture, connector pinout, and BMS handshake protocol. That common voltage rail and communication bus is why one SKU covers both the slim E7260 and the convertible 7400 2-in-1 chassis.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the E7260 platform. The BMS negotiated correctly with the Dell EC, charge current tapered cleanly at 100%, and no fault codes appeared in the battery status registers.
• BIOS learn cycle after install: After fitting this battery, run the laptop down to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS to reset its battery learn cycle against the new cell and clears the false "poor health" or "unknown battery" warning that appears after any cell swap on Dell Latitude hardware.

Why the Latitude E7260 shuts down at 20–30% after a battery swap

The E7260 uses a fuel gauge IC that builds its discharge model from the previous cell's EEPROM data. With a new cell installed, that model is stale. Under full CPU and display load, the laptop hits a voltage cliff — the cell voltage drops faster than the old model predicts, and the EC triggers an emergency shutdown before the gauge reaches 0%. Running two or three full discharge-to-hibernate and uninterrupted-charge cycles recalibrates the fuel gauge IC against the new cell's actual voltage curve and eliminates the premature cutoff.

Dell BIOS reporting wrong Wh rating after replacement

The Wh figure shown in Dell's battery report and in Windows Device Manager is read directly from the EEPROM on the cell, not calculated live from voltage and capacity. A replacement cell's EEPROM may carry a rated Wh value that differs slightly from the original OEM figure. This is an EEPROM data difference, not a capacity fault. The actual energy delivered by the cell reflects the real 72.96Wh chemistry. To confirm, open a command prompt as administrator and run powercfg /batteryreport — compare the "Design Capacity" against "Full Charge Capacity" after three full cycles to verify the cell is performing to spec.