About this replacement
ZTE Blade A510 / BA510 — 3.8V Li-Polymer Replacement Battery (Li3822T43P3h725640)
This is a 3.8V, 2200mAh (8.36Wh) lithium-polymer cell for the ZTE Blade A510 smartphone. It replaces OEM part numbers Li3822T43P3h725640 and Li3822T43P8h725640. If your original battery swells, no longer holds a charge, or causes unexpected shutdowns, this is the direct cell swap.
- Blade A510 and BA510 compatibility: Both model references use the same 3.8V nominal voltage rail, identical connector pinout, and the same BMS handshake protocol — which is why one cell covers both designations without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a ZTE Blade A510 unit. The BMS accepted the cell on the first connection, charge IC negotiated correctly, and protection circuits tripped at expected voltage thresholds at both ends of the curve.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC a clean discharge curve to calibrate against the new cell before high-current cycles begin.
Why the Blade A510 reports wrong battery percentage after a cell swap
The ZTE Blade A510 uses a coulomb counter inside the fuel gauge IC that builds its capacity model against the original cell's discharge curve. When you install a new cell, that stored model no longer matches the actual chemistry in the phone. The IC tries to interpolate percentage from voltage alone, which is unreliable across the flat mid-section of a lithium-polymer curve. One complete discharge-to-shutdown followed by an uninterrupted full charge resets the counter and feeds the IC real data from the new cell.
Sudden shutdown at 20–25% on the replacement cell
This is a voltage cliff failure, not a capacity problem. Under modem or display load, the cell voltage drops sharply around 3.5–3.6V if the fuel gauge IC is still calibrated to the old cell's internal resistance. The phone's protection circuit reads that voltage drop as critically low and cuts power before the displayed percentage reaches zero. Run the recalibration cycle described above — one full discharge to shutdown, one uninterrupted charge to 100% — and the IC will map the correct voltage-to-capacity curve for the new cell. If shutdown persists below 3.55V under load after two calibration cycles, check that the battery connector is fully seated.