TRAFCONE Solar Replacement Battery 3.8V 2000mAh Li-ion

TRAFCONE Solar / Z795G / Rapido Series — 3.8V Li-ion Replacement Battery

This is a 3.8V, 2000mAh (7.6Wh) Li-ion cell for TRAFCONE smartphones including the Solar, Z795G, Rapido, and Rapido LTE. It restores full power capacity to the phone after the original cell has degraded or failed to hold charge. Dimensions are 58.35 × 51.20 × 5.50mm — confirm these against your existing cell before ordering.

• Solar and Rapido series compatibility: These models share the same physical cell format, voltage rail, and connector orientation. The BMS on each device accepts this cell's charge and discharge profile without modification or adapter.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a representative unit. The BMS accepted the cell on first connection, protection circuits responded correctly to cutoff thresholds, and the charge IC stepped through its standard CC/CV stages without fault flags.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Why the TRAFCONE Solar reports wrong battery percentage after a cell swap

The fuel gauge IC on these phones uses a coulomb counter calibrated to the original cell's capacity and internal resistance curve. When you install a new cell, that stored reference no longer matches. The phone reads state-of-charge against the old curve, so the displayed percentage drifts — often reading 100% too quickly or dropping sharply in the lower range. One full discharge from 100% to auto-shutoff, followed by an uninterrupted charge to 100%, resets the coulomb counter to the new cell's actual curve.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity problem. Under combined modem and screen load, the cell's terminal voltage drops faster than the fuel gauge anticipates — it hits the hardware cutoff threshold while the OS still shows charge remaining. It happens most often in the first few cycles before the fuel gauge recalibrates. Run two to three full discharge-charge cycles at standard charge rate and the shutdowns will stop once the IC maps the actual voltage-to-capacity curve. If shutdowns continue past three cycles, check that the replacement cell voltage reads at least 3.6V at rest before installation.