BlackView BV7200 Li676281HTT Compatible Battery 3.85V 5250mAh

BlackView BV7200 — 3.85V Li-Polymer Replacement Battery (Li676281HTT)

This is a 3.85V, 5250mAh (20.21Wh) Li-Polymer cell for the BlackView BV7200 rugged smartphone. It replaces the original Li676281HTT battery when capacity has dropped or the cell has failed entirely. Fits the BV7200 directly — no modifications needed.

• BV7200 platform fit: The BV7200 uses a fixed connector and a fuel gauge IC tuned to a 3.85V nominal cell. This replacement matches that voltage rail and physical form factor, so the BMS handshake completes and the OS receives cell data correctly.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on a BV7200 unit. The BMS accepted the cell without fault codes, and the fuel gauge IC began tracking state-of-charge from the first cycle.
• First-cycle fast charge caution: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current fast charging pushes current into an uncalibrated cell.

Why the BV7200 reports wrong battery percentage after a cell swap

The BV7200 uses a coulomb-counting fuel gauge IC that builds its state-of-charge model from historical discharge data. When you swap in a new cell, that historical data no longer matches the new cell's actual capacity and voltage curve. The gauge reads percentage against the old model, so the numbers look off — often showing full charge too quickly or dropping faster than expected. One complete slow discharge down to auto-shutdown, followed by a full charge, forces the IC to recalibrate against the new cell.

Sudden shutdown at 20–30% on the BV7200 after battery replacement

This is a voltage cliff issue, not a capacity issue. Under high load — modem activity, screen at full brightness, GPS active — the cell voltage sags below the BMS cutoff threshold even though the gauge still shows charge remaining. It happens most often on the first few cycles before the fuel gauge IC has mapped the new cell's load-response curve. Run two full slow-charge cycles and check that the reported percentage at shutdown drops below 15% before assuming a fault. If shutdowns continue above 20%, check that the battery connector is fully seated — a partial connection raises internal resistance and worsens voltage sag under load.