Prestigio PAP5400 DUO Replacement Battery 3.7V 1500mAh

Prestigio MultiPhone 5400 Duo — 3.7V Li-ion Replacement Battery (PAP5400 DUO)

This is a 3.7V, 1500mAh Li-ion replacement battery for the Prestigio MultiPhone 5400 Duo dual-SIM smartphone. It fits both the MultiPhone 5400 Duo and 5400 Duo variants. Use it to restore function when the original cell has aged, swollen, or stopped holding charge.

• MultiPhone 5400 Duo compatibility: Both listed model variants share the same battery bay dimensions, 3.7V nominal rail, and connector pinout. The BMS on each accepts the same charge termination voltage, so one cell covers both configurations without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the MultiPhone 5400 Duo platform. The BMS accepted charge termination at 4.2V and engaged low-voltage cutoff correctly at the expected floor, with no false trips during screen-on and dual-SIM radio load.
• Fuel gauge recalibration on first cycle: After fitting a new cell, disable fast charging if available and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. The fuel gauge IC on the 5400 Duo maps its coulomb counter to the old cell's discharge curve — one full cycle rewrites that reference against the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the Prestigio MultiPhone 5400 Duo

This is a voltage-cliff failure. Under combined modem, screen, and dual-SIM radio load, the cell's internal resistance causes a rapid voltage drop that the BMS reads as below the cutoff threshold — even when the fuel gauge still shows charge remaining. A freshly installed cell with an uncalibrated fuel gauge IC makes this worse, because the percentage shown doesn't reflect actual cell voltage under load. Run one full discharge-charge cycle after installation. If shutdowns continue after calibration, check that the battery connector is seated fully — a loose contact adds resistance and deepens the voltage sag at the terminal.

Percentage jumping or freezing after cell replacement

The MultiPhone 5400 Duo uses a fuel gauge IC that tracks charge state against a stored discharge curve from the previous cell. A new cell has a different impedance profile, so the IC's estimates drift — the percentage may jump several points, freeze at an incorrect value, or drop suddenly. This is not a fault with the replacement cell. One complete discharge to BMS cutoff followed by a full uninterrupted charge allows the coulomb counter to re-anchor to the new cell's actual curve. After that cycle, percentage reporting stabilises.