AudioVox SMT5700 Replacement Battery BTE5700 3.7V 2200mAh

AudioVox SMT5700 — 3.7V Li-ion Replacement Battery (BTE5700)

This is a 3.7V Li-ion cell rated at 2200mAh (8.14Wh), built to the BTE5700 spec. It fits the AudioVox SMT5700 and SMT-5700 smartphones. It replaces the original cell when the phone no longer holds a charge or fails to power on.

• SMT5700 and SMT-5700 compatibility: Both model designations reference the same hardware platform — identical voltage rail, connector pinout, and BMS handshake. One cell fits both.
• Bench tested on actual hardware: We ran the BTE5700 through charge and discharge cycles on the SMT5700 platform. The BMS accepted the cell without error flags, and the charge IC cycled cleanly through trickle, CC, and CV phases.
• Fuel gauge recalibration on first use: On the first full cycle after installation, disable fast charging if your charger supports it. This gives the fuel gauge IC one clean discharge-charge pass to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell hits a voltage cliff under modem or screen load before the percentage counter reaches zero. The phone sees a valid state-of-charge reading right up until the voltage drops below what the load can sustain. Run one full discharge to near shutdown, then charge uninterrupted to 100% — the coulomb counter resets against the new cell after that cycle.

Phone reports wrong battery percentage after cell swap

The fuel gauge IC stores a charge model built from the old cell's internal resistance and capacity. A new cell has different impedance, so the IC's estimates drift immediately. Percentages may jump erratically or read higher than actual charge for the first few cycles. Let the phone discharge to auto-shutdown once, then charge to 100% without interruption — the IC recalibrates its model against actual cell voltage at 3.0V cutoff and 4.2V full charge.