ZTE AXON A2015 Compatible Battery Li3830T43P6h775556 3.8V

ZTE Axon A2015 Series — 3.8V Li-Polymer Replacement Battery (Li3830T43P6h775556)

This is a 3.8V, 3000mAh (11.4Wh) lithium-polymer cell that replaces the OEM battery in the ZTE Axon A2015, Axon Lux, Axon Pro, and Axon Tianji A2015 TD-LTE Dual SIM. It matches the original dimensions at 76.95 × 53.95 × 5.25mm and uses the same connector and BMS handshake as the factory unit. If your phone is shutting down early, charging slowly, or barely lasting a few hours, the original cell has degraded.

• Axon A2015 platform fit: The A2015, Axon Lux, Axon Pro, and Axon Tianji variants share the same physical bay dimensions, connector pinout, and BMS communication protocol — which is why one part number covers all of them. Swapping between these models does not require a different cell.
• Bench tested on actual hardware: We ran this cell through a full charge and load cycle. The BMS accepted charge without error flags, voltage held steady under display and modem load, and the protection circuit tripped cleanly at the expected low-voltage cutoff threshold.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. The A2015's fuel gauge IC was calibrated to the old cell's discharge curve — one full cycle at low current lets it recalibrate against the new cell before high-current charging begins.

Why the Axon A2015 reports wrong battery percentage after a cell swap

The A2015 uses a coulomb-counter fuel gauge IC that tracks charge in and charge out over time. When you swap the physical cell, the IC still holds the discharge curve data from the old, degraded battery. The new cell has a different internal resistance and a different voltage-to-capacity curve, so the IC's percentage estimates are off — sometimes significantly. After one full discharge down to auto-shutdown and a full charge back to 100% at standard rate, the IC resets its baseline and percentage accuracy returns to normal.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem, display, or a background app pulls a short burst of high current and the cell voltage drops below the BMS protection threshold faster than the fuel gauge can track. The phone reads 25% but the cell voltage has already fallen under load. It is more common in the first few cycles before the fuel gauge IC has mapped the new cell's actual discharge curve. Run two to three full discharge-charge cycles at standard charge rate — after that, the IC's load-compensation model catches up and the shutdowns stop.