MTC Android Evo Replacement Battery 3.7V 1100mAh Li-ion

MTC Android / Evo — 3.7V Li-ion 1100mAh Replacement Battery

This MTC battery is a 3.7V Li-ion cell rated at 1100mAh (4.07Wh), measuring 54.05 × 34.10 × 5.40mm. It fits Android and Evo smartphones where the original cell has degraded or failed. Match your device's physical dimensions before ordering — model naming across Android variants is inconsistent.

• Android / Evo platform fit: These models share a common cell footprint and voltage rail at 3.7V nominal. The connector pinout and BMS communication protocol are consistent across this battery family, which is why one cell covers both designations.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on compatible hardware. The BMS held cutoff at the correct upper limit and did not trip on a standard 500mA charge current. Coulomb counter readings stabilised after the first full cycle.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve — one full cycle lets it map the new cell before high-current charging is applied to an uncalibrated reference.

Why the phone reports wrong battery percentage after a cell swap

The fuel gauge IC on these devices uses a coulomb counter trained on the original cell's discharge curve. When a new cell goes in, that curve no longer matches — so the IC reports percentage against the wrong reference. The phone may show 40% and shut down, or jump from 80% to 20% without warning. One full discharge-to-charge cycle with fast charging off resets the counter against the new cell's actual curve.

Sudden shutdown at 20–30% charge remaining

This is a voltage cliff symptom, not a capacity problem. Under high-draw loads — active modem, screen at full brightness, GPS — the cell voltage sags below the BMS protection threshold before the fuel gauge reaches 0%. The BMS cuts power immediately to prevent cell damage. If this happens consistently above 20%, run a full calibration cycle first. If it persists, check that the cell connector is fully seated — a loose pin increases internal resistance and worsens voltage sag under load.