ZTE Blade A6 Lite Replacement Battery 3.85V 4850mAh

ZTE Blade A6 Lite — 3.85V Li-Polymer Replacement Battery (LI3849T44P8H906450)

This is a 3.85V, 4850mAh Li-Polymer cell for the ZTE Blade A6 Lite and its Dual SIM variants. It replaces part number LI3849T44P8H906450, the original factory-fitted cell. The battery slots into the Blade A6 Lite, Blade A6 Lite Dual SIM, and Blade A6 Lite Dual SIM TD-LTE.

• Blade A6 Lite family compatibility: The Dual SIM and TD-LTE variants share the same chassis, connector, and BMS handshake as the standard Blade A6 Lite. One part number covers the full range because the voltage rail and physical footprint are identical across the lineup.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on the Blade A6 Lite. The BMS accepted the charge protocol without fault flags, held voltage within spec under display and modem load, and the fuel gauge IC tracked draw without lockout events.
• Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one complete discharge-to-charge cycle at standard current. The fuel gauge IC is 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 is applied.

Why the Blade A6 Lite shuts down suddenly at 20–30% after a battery swap

This is a voltage cliff issue, not a capacity issue. Under peak modem or screen load, the new cell's voltage drops sharply at a point the phone's protection circuit reads as critically low — even when the displayed percentage suggests otherwise. The fuel gauge IC is still running against the old cell's stored discharge map, so it reports inaccurate headroom. One full discharge to around 3.4V under normal use, followed by a full charge, rewrites the reference curve and eliminates the false cutoff.

USB fast charge not activating on the replacement cell's first cycle

On the first cycle after installation, the phone's charge IC may refuse to negotiate fast charge with an uncalibrated cell. The BMS presents higher impedance on a new cell than on a worn one, and some charge controllers read that as a fault condition and fall back to standard 5V charging. This is not a hardware defect. Complete one full standard-rate charge cycle first — once the BMS and charge IC have exchanged a complete session, fast charge re-enables automatically on the next plug-in.