Avus S62 Replacement Battery 3.7V 1700mAh Li-ion

Avus S62 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1700mAh Li-ion replacement battery for the Avus S62 smartphone. It fits the S62 directly and restores power to calls, messaging, and mobile functions. Capacity is 6.29Wh — matched to the original cell specification.

• S62 cell fit: The S62 uses a single-cell Li-ion pack at 3.7V nominal. This replacement shares the same voltage rail, connector pinout, and physical dimensions (66.20 × 44.00 × 5.10mm), so the BMS handshake completes on first boot without triggering an unrecognised-battery warning.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the S62 platform. The BMS accepted the cell on the first connection, charge current ramped normally through CC to CV phase, and no thermal cutoff events occurred across three full cycles.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the coulomb counter locks in its reference points — skipping this step causes inaccurate percentage readings for the first several days.

Why the S62 reports wrong battery percentage after a cell swap

The S62 fuel gauge IC stores a learned discharge curve from the old cell. When a new cell goes in, the IC still references those old calibration points, so the percentage display drifts — sometimes reading 40% when the cell is near cutoff. The fix is one full discharge-charge cycle at standard current with fast charging disabled. After that cycle, the coulomb counter resets its baseline against the new cell's actual capacity. Most users see accurate readings settle within two to three cycles.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display pulls a current spike the new cell can't sustain at that state of charge — voltage drops below the BMS cutoff threshold even though the gauge still shows charge remaining. It's a voltage cliff, not a capacity problem. The fuel gauge IC is reading stored charge, not live terminal voltage under load. Run two full discharge cycles to let the gauge IC recalibrate its low-voltage cutoff reference; shutdowns typically stop once it learns the new cell's actual 3.0V floor.