ZTE N986 Replacement Battery Li3823T43P3h735350 3.8V 2300mAh

ZTE N986 / V975 Series — 3.8V Li-ion Replacement Battery (Li3823T43P3h735350)

This is a 3.8V, 2300mAh Li-ion cell that replaces the OEM battery in the ZTE N986, V975, U988S, Q802T, and over 36 compatible models. It matches the original voltage rail and physical footprint at 72.90 × 53.60 × 4.70mm. Swap it in when the original cell no longer holds charge or causes unexpected shutdowns.

• N986 / V975 platform compatibility: These models share the Li3823T43P3h735350 form factor and 3.8V nominal rail. The connector pinout and BMS handshake are consistent across the N986, V975, U988S, and Q802T, so one cell covers the full group without modification.
• Bench tested on actual hardware: We cycled this cell through charge and load on the N986 platform. The BMS accepted the charge IC handshake on the first cycle and held voltage within spec across both idle and screen-on modem load.
• Fuel gauge recalibration 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 time to map the new cell's discharge curve before fast charge pushes high current into an uncalibrated state.

Sudden shutdown at 20–30% on the ZTE N986 after a cell swap

The N986's fuel gauge IC retains the discharge curve of the old, degraded cell after a swap. When the new cell hits a voltage point the IC associates with 20–30% on the old curve, it can trigger an emergency shutdown — even though actual charge remains. This is a coulomb counter mismatch, not a cell defect. One full uninterrupted discharge down to automatic power-off, followed by a full charge, resets the reference curve and stops the false cutoffs.

Phone won't power on after the replacement battery sat in storage

Li-ion cells self-discharge during storage. If the cell dropped below approximately 2.5V per cell, the BMS enters a lockout state and blocks normal boot to protect the cell from damage. Plug the phone into a wall charger — not a PC USB port — and leave it for 15–20 minutes without pressing the power button. The charge IC will trickle current into the cell until voltage clears the BMS recovery threshold, at which point the phone will boot or show the charging screen normally. If voltage has fallen below 2.0V, the BMS may not recover and the cell should be replaced.