BlackView BL8800 Compatible Battery Li456182PHTT-B 3.85V 8300mAh

BlackView BL8800 — 3.85V Li-Polymer Replacement Battery (Li456182PHTT-B)

This is a 3.85V, 8300mAh (31.96Wh) Li-Polymer cell for the BlackView BL8800 rugged smartphone. It replaces the original Li456182PHTT-B battery when the factory cell has degraded, lost capacity, or stopped holding charge. Installation restores the phone to full operating capacity.

• BL8800 cell compatibility: The BL8800 uses a large-format Li-Polymer pouch cell with a dedicated fuel gauge IC that tracks charge state. This replacement matches the OEM voltage, physical footprint, and connector pinout so the fuel gauge IC receives valid data from the new cell without triggering a hardware fault.
• Bench tested on actual hardware: We ran charge and discharge cycles through the BL8800's charge IC and confirmed the BMS accepted the cell, completed a full charge cycle without cutoff errors, and reported stable voltage across the discharge curve.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle before enabling Dart Charge or any high-current protocol. This lets the fuel gauge IC learn the new cell's discharge curve before high-current charging pushes current into an uncalibrated state reference.

Sudden shutdown at 20–30% on the BL8800 after a cell swap

The BL8800's fuel gauge IC holds a charge curve calibrated to the original cell. When a new cell is installed, the IC's stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. Under high load — active LTE, GPS, or screen-on — the new cell's voltage can drop faster than the IC predicts, crossing the hardware low-voltage cutoff before the OS shows a low battery warning. One full discharge-charge cycle without fast charging forces the coulomb counter to rebuild its reference map against the new cell. After that cycle, the shutdown-at-20% behaviour typically stops.

USB-PD or Dart Charge not activating after replacement

On the first charge cycle after a cell swap, the BL8800's charge IC may default to standard 5V/1A input rather than negotiating the fast-charge protocol. This happens because the charge IC sees an uncalibrated cell with no established internal resistance baseline and throttles input current as a protective measure. To clear this, complete one full charge on a standard charger, then power the phone fully off and back on before connecting the Dart Charge adapter. The fast-charge handshake typically re-establishes on the second cycle once the IC has a baseline resistance reading for the new cell.