About this replacement
ZTE N960 / U236 / X920 — 3.7V Li-ion Replacement Battery (Li3712T42P3h734141)
This is a 3.7V, 900mAh Li-ion cell built to the OEM spec for the ZTE N960, U236, and X920 smartphones. It slots directly into the same battery bay and connects to the same fuel gauge circuit as the original. Capacity figures come from product data — 3.33Wh total energy.
- N960, U236, and X920 platform: These three models share the same battery bay dimensions (72.85 × 41.00 × 4.30mm), the same 3.7V nominal voltage rail, and the same connector pinout. One cell fits all three without modification.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the N960 and monitored BMS handshake behaviour. The protection circuit tripped correctly at low-voltage cutoff and accepted charge current without fault codes.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.
Sudden shutdown at 20–30% on the N960 after a cell swap
The N960's fuel gauge IC stores a discharge curve calibrated to the original cell. A new cell has a slightly different voltage-to-capacity curve, so the gauge can misread remaining charge by a wide margin. When the modem fires during a call or the screen peaks in brightness, the actual cell voltage drops below the hardware cutoff threshold — even though the OS still shows 25%. The fix is one full discharge to automatic shutdown followed by a full uninterrupted charge, which forces the coulomb counter to reset against the new cell's actual curve.
Device not powering on after the replacement cell sat in storage
Li-ion cells self-discharge in storage, and if this battery sat below 2.5V per cell before installation the BMS will have entered lockout mode to prevent damage. The phone shows no response — no charging indicator, no boot logo. Connect the phone to a wall adapter (not a PC USB port, which may not supply enough current to wake the BMS) and leave it for 15–20 minutes without pressing any buttons. The BMS needs a sustained trickle current to exit lockout; once the cell climbs above approximately 2.7V, normal charging resumes.