Prestigio PSP3453 DUO Replacement Battery 3.7V 1400mAh

Prestigio PSP3453 DUO — 3.7V Li-ion Replacement Battery (PSP3453 DUO)

This 3.7V 1400mAh Li-ion cell is a direct swap for the battery in the Prestigio PSP3453 DUO dual-SIM smartphone. It matches the original voltage and capacity spec, restoring power to calls, messaging, and basic apps. Install requires removing the back cover and disconnecting the original flat-flex connector.

• PSP3453 DUO dual-SIM platform: Running two active SIM slots doubles the modem draw compared to single-SIM mode. Both radios poll the network simultaneously, which pulls harder on the cell under peak load. This replacement cell is rated to the same 1400mAh capacity as the original to handle that combined radio draw.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the PSP3453 DUO platform. The BMS accepted the cell without error flags, and charge termination triggered correctly at 4.2V. Voltage held stable under simultaneous screen-on and dual-radio load.
• Fuel gauge recalibration on first cycle: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging begins. Skipping this step is the main cause of erratic percentage readings in the first few days.

Sudden shutdown at 20–30% on the PSP3453 DUO after a cell swap

This is a voltage cliff issue, not a capacity problem. When the fuel gauge IC is still calibrated to the old cell's discharge curve, it reports 25% remaining while the new cell's actual open-circuit voltage has already dropped below what the modem needs to sustain a call or data session. The phone shuts down because the load voltage collapses, not because the gauge hit zero. One full discharge-charge cycle lets the coulomb counter reset its endpoint and eliminates most of these early shutdowns.

Phone does not power on after sitting in storage with a flat battery

If the PSP3453 DUO was stored discharged for weeks, the cell may have drained below 2.5V. At that level, the BMS locks out charge current as a safety measure and the phone shows nothing on screen. Plug into a wall adapter — not a USB port — and leave it for 20–30 minutes without pressing the power button. The charge IC delivers a trickle recovery current to bring the cell above the BMS unlock threshold, typically around 3.0V, before normal charging resumes.