Pantech Perception BRT52AB Replacement Battery 3.7V 1700mAh

Pantech Perception Series — 3.7V Li-ion Replacement Battery (BRT52AB)

This is a 3.7V, 1700mAh Li-ion battery for the Pantech Perception, Perception 4G, ADR930L, and Premia V smartphones. It replaces OEM part numbers BRT52AB and BTR930B. Fit this battery when the original cell has degraded, swells, or no longer holds a usable charge.

• Perception series compatibility: The Perception and Perception 4G share the same 3.7V battery bay, connector pinout, and BMS handshake protocol — one cell covers both variants without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Perception platform. The BMS accepted charge current correctly, protection circuits tripped at expected cutoff thresholds, and no thermal anomalies were recorded.
• Fuel gauge recalibration after install: On first use, disable any fast-charge mode and run one full discharge-to-charge cycle before normal use. This lets the fuel gauge IC map the new cell's discharge curve before the charge controller pushes higher current into an uncalibrated cell.

Why the Perception reports wrong battery percentage after a cell swap

The Perception's fuel gauge IC stores a learned discharge curve from the original cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The IC reads voltage but maps it against the old curve, producing inaccurate percentage readings. One full discharge cycle down to automatic shutdown, followed by a complete charge to 100%, forces the coulomb counter to reset and relearn the new cell's curve.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops sharply under load — typically when the modem fires a transmission burst or the screen peaks brightness — before the fuel gauge triggers a low-battery warning. The cell voltage collapses below the BMS cutoff threshold, around 3.0V, faster than the percentage reading suggests. A fresh cell that hasn't completed its first calibration cycle is most prone to this. Run one full discharge-charge cycle and check that resting voltage reads at least 4.15V after a full charge.