ZTE Tempo X Replacement Battery Li3822T43p4h736040 3.8V 2100mAh

ZTE Tempo X / N9137 — 3.8V Li-ion Replacement Battery (Li3822T43p4h736040)

This 3.8V, 2100mAh Li-ion battery replaces the OEM cell in the ZTE Tempo X, Tempo Go, and N9137 smartphones. It matches the original form factor at 73 × 60 × 4mm, fitting the battery bay without modification. Voltage and BMS interface specifications match the OEM part number Li3822T43p4h736040.

• Tempo X / Tempo Go / N9137 platform fit: These models share a common battery bay dimension and the same 3.8V nominal voltage rail. The connector pinout and BMS communication protocol are identical across this ZTE budget-tier lineup, so one cell serves all listed variants.
• Bench tested on actual hardware: We cycled this cell on a ZTE N9137 unit and monitored BMS handshake, charge acceptance, and cutoff behaviour. The charge IC accepted the cell on the first cycle without fault codes, and the BMS terminated charge cleanly at 4.35V as expected.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes into an uncalibrated state — percentage readings stabilise after this single cycle.

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

This is a voltage-cliff issue, not a capacity problem. When the modem transmits or the screen peaks, instantaneous current draw pulls cell voltage below the BMS cutoff threshold — even though the fuel gauge still shows charge remaining. The old cell's discharge curve is baked into the coulomb counter; the new cell hits its voltage floor at a different state of charge. One full discharge-charge cycle without fast charging resets the fuel gauge IC and eliminates most of these shutdowns.

Phone not powering on after the replacement battery sat in storage

Li-ion cells self-discharge during storage. If a replacement cell has dropped below approximately 2.5V, the BMS enters lockout and blocks normal charging to prevent thermal risk. The phone will not power on and may show no charging indicator at all. Connect the phone to a wall charger — not USB from a PC — and leave it for 20–30 minutes before attempting to power on; the charge IC applies a trickle recovery current that brings the cell above the BMS re-enable threshold, typically around 2.8V.