Vienod V105 Replacement Battery 3.7V 900mAh Li-ion

Vienod V105 / V206 / VF241 — 3.7V Li-ion Replacement Battery

This is a 3.7V 900mAh Li-ion cell for the Vienod V105, V206, and VF241 smartphones. It replaces a degraded or failed original battery when the phone no longer holds charge or refuses to power on. Physical dimensions are 53.00 × 34.00 × 4.30mm — verify these against your existing cell before installation.

• V105, V206, and VF241 compatibility: These three Vienod models share the same battery bay dimensions, voltage rail, and connector pinout, which is why a single cell covers all three. Swap one SKU across the range without adapters or modifications.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on compatible hardware and confirmed the BMS accepts the charge IC handshake without triggering a protection cutoff or error state.
• First-cycle fast charge protocol: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Why the Vienod V105 reports wrong battery percentage after a cell swap

The fuel gauge IC on these phones uses a coulomb counter that builds a discharge model from the original cell's behaviour over many cycles. When you install a new cell, that stored model no longer matches actual cell chemistry. The phone reads voltage and maps it to a percentage using stale calibration data — so 70% on screen might be 50% of real capacity. Run one full discharge to below 5% and a full charge to 100% without interruption. After that cycle, the IC rebuilds its curve against the new cell and percentage accuracy improves significantly.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff, not a capacity fault. Under peak load — active calls, screen at full brightness, or background sync — the cell voltage drops sharply below the threshold the BMS will sustain. The phone shuts down even though the coulomb counter still shows charge remaining. It happens most often in the first few cycles before the fuel gauge IC recalibrates. Run two full discharge-charge cycles and check whether the cutoff point shifts lower. If shutdown still occurs at or above 25%, measure open-circuit voltage after shutdown — it should read above 3.5V, confirming the cell is healthy and the gauge needs further calibration.