About this replacement
BlackView A80 Pro — 3.85V Li-Polymer Replacement Battery (DK017)
This is a 3.85V, 4000mAh Li-Polymer replacement battery for the BlackView A80 Pro smartphone. It uses OEM part number DK017 and matches the original cell's voltage, physical dimensions, and connector. Fit the original battery no longer holding a charge or the phone shutting down unexpectedly, this cell restores full operation.
- A80 Pro cell compatibility: The A80 Pro uses a sealed unibody chassis with a dedicated battery bay sized for an 86.40 × 63.30 × 4.40mm cell. The DK017 matches those dimensions exactly and connects via the original flex-ribbon connector, so no modification to the bay or connector is needed.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the A80 Pro platform. The BMS handshake completed on first cycle, charge IC accepted the cell without error flags, and the fuel gauge IC began tracking state-of-charge correctly after one full discharge.
- Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging pushes current into an uncalibrated cell.
Sudden shutdown at 20–30% on the A80 Pro after a cell swap
This happens because the fuel gauge IC is still running the discharge curve from the old degraded cell. The new cell has a steeper voltage drop at lower states of charge than the IC expects, so the phone sees a voltage cliff and cuts power before the display hits 0%. One full slow discharge-charge cycle after installation forces the coulomb counter to relearn the new cell's curve. After that cycle, the shutdowns stop.
Phone not powering on after the replacement cell sat in storage
Li-Polymer cells self-discharge during storage. If the cell voltage drops below 2.5V per cell, the BMS trips a deep-discharge lockout and blocks current flow to protect the cell from damage. The phone will not power on and may not show any charging indicator at first. Connect to a wall charger — not USB from a PC — and leave it for 20–30 minutes before attempting to power on. The charge IC will trickle current into the cell to bring voltage above the BMS recovery threshold, typically around 3.0V.