ZTE Blade Q Mini Li3815T43P3h615142 Compatible Battery 3.8V 1500mAh

ZTE Blade Q Mini / Z667 Series — 3.8V Li-ion Replacement Battery (Li3815T43P3h615142)

This is a 3.8V, 1500mAh Li-ion cell built to fit the ZTE Blade Q Mini and the Z667 family — including the Z667T, Z667G, and Z667 variants. It slots into phones that have lost charge capacity or stopped holding power altogether. Capacity is rated at 1500mAh (5.7Wh), matching the original OEM specification.

• Blade Q Mini and Z667 platform fit: These models share the same battery footprint, connector pinout, and BMS handshake protocol — one cell covers the entire range without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on ZTE hardware and confirmed the BMS accepted the cell without triggering a protection fault or rejecting the charge IC handshake.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate — this lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins on an uncalibrated cell.

Sudden shutdown at 20–30% on the Blade Q Mini after a cell swap

The Blade Q Mini's fuel gauge IC stores a discharge curve calibrated to the old cell. When a new cell is installed, the gauge doesn't yet know where the actual voltage cliff sits. Under load — modem transmitting, screen on full brightness — cell voltage drops faster than the gauge predicts, and the phone cuts out before the reported percentage reaches zero. This isn't a faulty battery. It's a calibration gap. Run one complete discharge to automatic shutdown, then charge uninterrupted to 100%, and the coulomb counter will remap to the new cell's actual curve.

Phone feels warm near the battery during the first few charges

A new Li-ion cell has higher internal impedance than a broken-in cell. During the first one to three charge cycles, the charge IC pushes current into a cell that resists it slightly more than usual — that resistance converts to heat. This is normal and diminishes as the cell cycles. If the phone still feels hot to the touch after three full cycles, check that the battery connector is fully seated and no pins are bent — a partial connection forces the charge IC to compensate and generates excess heat.