About this replacement
Dell Alienware ECHO 13 — 14.8V Li-Polymer Replacement Battery (3V806 / 62N2T)
This is a 14.8V, 3100mAh (45.88Wh) lithium-polymer replacement battery for the Dell Alienware ECHO 13 and Alienware 13 series, including the QHD and ALW13ED-1508 variants. It replaces OEM part numbers 3V806 and 62N2T. Install it when the original cell no longer holds voltage under load or fails to charge past a low threshold.
- Alienware 13 series compatibility: The ECHO 13, QHD, and ALW13ED-1508 all run the same 14.8V battery rail with an identical connector and BMS handshake protocol — one cell covers the full lineup without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Alienware 13 platform. The BMS handshake authenticated correctly, charge current ramped normally through CC and CV phases, and protection thresholds triggered at expected cutoff voltages.
- Post-install discharge cycle: After fitting this cell, run a 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 after every cell swap on this platform.
BIOS reporting poor battery health immediately after installation
The Alienware BIOS reads health data from the old cell's EEPROM and compares it against the new cell's charge signature. A fresh cell looks mismatched to the firmware, so it flags the battery as degraded. This is a calibration gap, not a fault. Running one full discharge-to-hibernate then a complete uninterrupted charge gives the BIOS enough cycle data to update its health assessment. After that single learn cycle, health reporting normalises on this platform.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC is still calibrated against the old cell's capacity curve. The gauge reads 25% remaining but the actual cell voltage has already hit the BMS low-voltage cutoff — the system shuts down because the cell can't sustain voltage under combined CPU and display load. The fix is calibration: run the battery down to forced hibernate at the lowest possible brightness and CPU state, then charge fully without interruption. Repeat once more if the shutdowns continue — two cycles typically align the fuel gauge to the new cell, and the cutoff should match the gauge below 10V per cell group.