ZTE N986 Li3823T43P3h735350 Replacement Battery 3.7V 1800mAh

ZTE N986 / V975 / U988S Series — 3.7V Li-ion Replacement Battery (Li3823T43P3h735350)

This is a 3.7V, 1800mAh Li-ion cell built to OEM part number Li3823T43P3h735350. It fits the ZTE N986, V975, U988S, Q802T, and over 36 additional ZTE handsets sharing this battery footprint. Capacity and voltage figures come directly from product data — 6.66Wh total energy.

• Multi-model fit across ZTE's mid-range line: The N986, V975, U988S, and Q802T share an identical battery bay geometry, connector pinout, and BMS handshake voltage range — that is why one cell covers all of them. Any variant in the 36-model list uses the same 3.7V nominal rail and Li3823T43P3h735350 OEM reference.
• Bench tested on actual hardware: We cycled this cell through charge and load discharge on a ZTE N986 unit. The BMS accepted the cell, completed a full charge cycle without cutoff errors, and held voltage above 3.5V under sustained screen-on load.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This gives the fuel gauge IC a clean reference against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.

Why the ZTE N986 reports wrong battery percentage after a cell swap

The fuel gauge IC on the N986 builds its percentage model from the discharge curve of the previous cell. When a new cell goes in, the IC is still referencing old coulomb-counter data. The result is percentage readings that are off by 10–20%, or a sudden jump when the phone recalculates mid-cycle. One full discharge from 100% down to automatic cutoff, followed by a full charge, resets the coulomb counter and anchors the gauge to the new cell's actual capacity.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under modem transmit or display load — a voltage cliff the fuel gauge did not predict. The phone's protection circuit reads the sag as a critically low-voltage event and forces shutdown, even though the displayed percentage looks safe. The root cause is an uncalibrated gauge reading surface charge rather than true state-of-charge. Run one full calibration cycle and check that resting cell voltage after a full charge reads 4.15–4.20V before declaring a fault.