Uniwill E10 Replacement Battery 11.1V 4400mAh Li-ion

Uniwill E10 / E10IL2 — 11.1V Li-ion Replacement Battery (E10-3S4400-S1S6)

This is an 11.1V Li-ion battery rated at 4400mAh (48.84Wh) for the Uniwill E10 and E10IL2 laptops. It replaces the original cell when capacity has degraded and the notebook can no longer hold a charge. OEM part numbers covered include E10-3S4400-S1S6, E10-3S4400-C1L3, E10-3S4400-G1L3, E10-4S2200-C1L3, and E10-4S2200-G1L3.

• E10 and E10IL2 platform fit: Both models share the same battery bay geometry, connector pinout, and BMS handshake protocol. The 3S cell configuration runs a nominal 11.1V rail that both chassis expect — swapping between these two models does not require any firmware adjustment.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the E10 platform. The BMS communicated correctly with the system board, charge termination triggered cleanly at capacity, and no overcurrent faults were logged during load testing.
• First-use discharge cycle on the E10: After fitting this battery, run the laptop on battery power until it hibernates at low-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 battery health as poor immediately after fitting a new cell

The Uniwill E10 BIOS reads health data from EEPROM registers stored on the battery pack, not from live cell voltage. When a new cell is installed, those registers carry no cycle history the BIOS recognises, so it flags the pack as unknown or poor. This is not a fault with the replacement cell — it is a calibration state. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%, and the BIOS learn cycle will rewrite the health registers against the new cell's actual capacity.

Laptop cutting out at 20–30% charge shown on the fuel gauge

This symptom points to a voltage cliff under combined CPU and display load, not a gauge error. When the original cell aged, the fuel gauge IC built its discharge curve around degraded cells — it does not automatically recalibrate to a new cell's chemistry. The stored curve causes the OS to report 25% remaining while the actual cell voltage has already dropped below the protection threshold. Run two or three full discharge-to-cutoff cycles to force the fuel gauge IC to rebuild its curve against the new 11.1V cell, and the shutdown point will shift back to the correct low-voltage floor.