Auro Utano V2 Replacement Battery 3.7V 1050mAh Li-ion

Auro Utano V2 — 3.7V Li-ion 1050mAh Replacement Battery

This is a 3.7V, 1050mAh Li-ion cell for the Auro Utano V2 smartphone. It fits directly into the Utano V2 handset and restores power when the original cell has degraded past useful capacity. Dimensions are 53.16 × 33.77 × 5.34mm — confirm these against your original cell before installing.

• Utano V2 fitment: The Utano V2 uses a compact 3.7V single-cell configuration. This replacement matches that voltage rail and physical footprint, so the connector seats correctly and the BMS can communicate with the phone's charge IC without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held charge termination cleanly and the protection circuit tripped correctly at the low-voltage cutoff threshold — no runaway draw observed.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-to-charge cycle. The fuel gauge IC on the Utano V2 is calibrated to the original cell's discharge curve — a full cycle on the new cell lets it re-anchor its coulomb counter before high-current charging begins.

Sudden shutdown at 20–30% on the Utano V2 after a cell swap

This happens because the fuel gauge IC is still reading the old cell's discharge curve. The new cell hits a voltage cliff — where terminal voltage drops sharply under modem or screen load — at a different state of charge than the original. The phone's protection circuit reads this as a critical low-voltage event and shuts down, even though the displayed percentage looks safe. One complete discharge-to-empty followed by a full uninterrupted charge resets the coulomb counter and eliminates most of these early shutdowns.

Phone feels warm near the battery during the first few charges

A new Li-ion cell has higher internal impedance than a broken-in cell. When the charge IC pushes current into a high-impedance cell, more energy converts to heat at the cell surface. This is normal for the first two to three cycles and reduces as the cell's impedance settles. If warmth persists beyond the third full charge or the phone becomes hot to the touch, stop charging and check that the replacement cell dimensions match — 53.16 × 33.77 × 5.34mm — as an oversized cell trapped under the back cover can restrict airflow and hold heat.