About this replacement
Prestigio MultiPhone 5505 DUO — 3.7V Li-ion Replacement Battery (PSP5505 Duo)
This 3.7V Li-ion cell replaces the original battery in the Prestigio MultiPhone 5505 DUO dual-SIM smartphone. Capacity is 1800mAh (6.66Wh), matching the stock specification. Fits the MultiPhone 5505 DUO only — confirm your model before ordering.
- MultiPhone 5505 DUO fit: The dual-SIM variant uses a dedicated connector and contact layout. This cell matches that layout. Single-SIM 5505 variants use a different battery — the part number PSP5505 Duo applies to the DUO model only.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the 5505 DUO platform. The BMS accepted the cell without error flags, and the charge IC completed a full CC/CV charge cycle without interruption.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle. This gives the fuel gauge IC a full sweep of the new cell's discharge curve before it starts reporting percentage to the OS.
Sudden shutdown at 20–30% on the MultiPhone 5505 DUO
The 5505 DUO runs two active SIM radios simultaneously. When both radios transmit at the same time — during a call on one SIM while the second polls for signal — the current draw spikes sharply. A cell with any internal resistance above spec cannot hold voltage under that load. The BMS reads the voltage drop as a hard cutoff threshold and shuts the phone down, even though the fuel gauge still shows charge remaining. One full calibration cycle after replacement brings the fuel gauge IC in line with the real discharge curve of the new cell, and the premature shutdowns typically stop.
OS percentage jumping erratically after cell swap
The fuel gauge IC on the 5505 DUO stores a learned charge curve from the previous cell. When a new cell goes in, that stored curve no longer matches the actual voltage-to-capacity relationship of the replacement. The phone reads a raw voltage, maps it against the old curve, and outputs an incorrect percentage — sometimes jumping 10–15% in either direction. Run one uninterrupted discharge down to auto-shutdown, then charge to 100% without interruption. After that single cycle the coulomb counter resets against the new cell and percentage reporting stabilises.