BlackView A8 MAX AB1683 Compatible Battery 3.8V 2950mAh

BlackView A8 MAX — 3.8V Li-Polymer Replacement Battery (AB1683)

This is a 3.8V, 2950mAh Li-Polymer cell sourced as a direct replacement for the BlackView A8 MAX smartphone. It fits the original battery bay and connects to the same flex connector as the factory cell. Use it when the original battery no longer holds a usable charge or the phone refuses to power on.

• A8 MAX battery bay fit: The A8 MAX uses a fixed rear-cover design with a dedicated battery compartment sized for this 94.00 × 63.30 × 4.00 mm cell. The AB1683 part number matches the OEM connector pinout and the charge IC's voltage thresholds, so the BMS handshake completes without fault flags.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the bench. The BMS held charge termination at the correct 4.35V cutoff and did not trip the overcurrent latch during the modem-active load phase.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one full discharge down to automatic shutdown, then charge to 100% uninterrupted. This lets the fuel gauge IC map the new cell's discharge curve before fast charge current is applied to an uncalibrated cell.

Why the A8 MAX reports wrong battery percentage after a cell swap

The A8 MAX uses a coulomb counter that builds its model against the original cell's capacity and internal resistance. When a new cell goes in, the stored model no longer matches the actual discharge curve. The phone reads a voltage that maps to the old cell's state-of-charge table, so it shows 40% when the cell may be at 60%. One full discharge-to-shutdown followed by a full uninterrupted charge resets the coulomb counter and rebuilds the model against the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC has not yet calibrated the new cell's voltage cliff. Under modem or screen load, the cell voltage dips sharply around 3.5–3.6V, which the uncalibrated gauge misreads as a safe mid-range level until the phone's undervoltage protection cuts power. It is not a faulty cell. Complete one full supervised discharge cycle — let the phone shut itself off naturally — then charge to 100% without interruption. After that cycle, the gauge maps the correct voltage-to-capacity curve and the shutdowns stop.