About this replacement
ZTE Blade A3 / Blade A5 Series — 3.7V Li-ion Replacement Battery (Li3714T42P3h765039)
This is a 3.7V, 1500mAh Li-ion replacement cell for the ZTE Blade A3, Blade A5, T220, and T230 smartphones. It matches the OEM part number Li3714T42P3h765039 and fits the same physical envelope — 75.50 × 49.80 × 3.80mm. Voltage and capacity come from the product data, not estimates.
- Blade A3 / A5 / T220 / T230 platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers all of them without adapter or modification.
- Bench tested on actual hardware: We ran the cell through charge-discharge cycles on the Blade A3 platform. The BMS accepted the cell on first insertion, and the charge IC negotiated correctly without triggering protection lockout.
- 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 map the new cell's discharge curve before high-current charging pushes into an uncalibrated state.
Sudden shutdown at 20–30% on the Blade A3 after a cell swap
This happens because the fuel gauge IC still references the discharge curve of the old, degraded cell. When screen or modem load spikes, the new cell's voltage drops faster than the IC expects — it interprets this as a critical low and cuts power. It is not a defective battery. One full discharge-charge cycle without fast charging lets the coulomb counter recalibrate against the real discharge curve, and the shutdowns stop.
Phone won't power on after the battery sat in storage
Li-ion cells left uncharged for extended periods can drop below 2.5V per cell, triggering BMS lockout — the battery stops responding to protect against unsafe recovery charging. The phone shows nothing when connected to a charger. Connect to a wall adapter and leave it for 20–30 minutes without pressing the power button. The BMS needs a low-current trickle to bring the cell voltage back above the re-initialisation threshold, typically around 2.9V, before normal charging resumes.