ZTE F158 Li3717T42P3h5637116 Compatible Battery 3.7V 1700mAh

ZTE F158 / X185 Series — 3.7V Li-ion Replacement Battery (Li3717T42P3h5637116)

This is a 3.7V, 1700mAh Li-ion cell that fits the ZTE F158, F159, X185, G180, and eight additional ZTE models sharing the same battery cavity and connector. It matches OEM part number Li3717T42P3h5637116. Capacity is 1700mAh (6.29Wh) — taken from product data, not estimated.

• F158 / F159 / X185 / G180 platform fit: These models share a common PCB layout, battery connector pinout, and BMS handshake protocol. The same 3.7V nominal rail and physical footprint (55.20 × 36.67 × 11.43mm) runs across the entire group, so one cell services all of them without modification.
• Bench tested on actual hardware: We cycled this cell on a ZTE F158 unit and monitored BMS communication throughout. The protection circuit accepted charge current without tripping, voltage held stable under screen-on and modem load, and the fuel gauge IC registered cell capacity without throwing an error flag.
• Fuel gauge recalibration on first install: On first use after fitting this cell, disable fast charging and run one full discharge-to-charge cycle at standard rate. This gives the fuel gauge IC one clean pass to map the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Why the ZTE F158 reports wrong battery percentage after a cell swap

The fuel gauge IC on the F158 uses a coulomb counter that was calibrated against the original cell's impedance and discharge curve. When a new cell goes in, that stored curve no longer matches the actual cell behaviour. The IC keeps referencing stale data, so the percentage shown on screen drifts from the true state of charge. One full discharge cycle — draining to automatic shutdown and charging back to 100% at standard rate — resets the counter and lets the IC build a fresh baseline against the new cell.

Sudden shutdown at 20–30% on the ZTE F158

This is a voltage cliff, not a capacity fault. Under peak load — modem transmission or display at full brightness — the cell voltage drops sharply below the BMS cutoff threshold even though the fuel gauge still reads 20–30%. The BMS interprets this as an undervoltage condition and trips the protection circuit to prevent cell damage. The fix is that full discharge-charge recalibration cycle: once the fuel gauge IC has an accurate curve for this cell, it adjusts its low-battery warning earlier and the OS initiates a controlled shutdown before hitting the cliff. After one complete cycle, confirm the cell rests at 4.15–4.20V when fully charged.