Prestigio PSP7501 DUO Compatible Battery 3.8V 2300mAh

Prestigio PSP7501 DUO — 3.8V Li-ion Replacement Battery (PSP7501 DUO)

This 3.8V, 2300mAh Li-ion cell is a direct replacement for the Prestigio PSP7501 DUO smartphone. It fits the PSP7501 DUO specifically — matching the voltage rail, connector pinout, and BMS communication expected by the device's charge IC. Capacity is 2300mAh (8.74Wh) as listed in the product specification.

• PSP7501 DUO compatibility: The PSP7501 DUO uses a fixed connector layout and a 3.8V nominal cell. The phone's charge IC handshakes with the BMS over the battery connector — a mismatched cell voltage or missing thermistor line will block charging entirely. This cell matches all three.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on PSP7501 DUO-class hardware. The BMS accepted the charge IC handshake immediately, cell voltage held stable under screen-on and modem load, and no protection cutoff triggered during the test cycle.
• Fuel gauge recalibration on first use: On first installation, disable any fast charge mode and run one full discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC one complete cycle to map the new cell's discharge curve before the OS starts reporting percentage from a calibrated baseline.

Sudden shutdown at 20–30% on the PSP7501 DUO after a cell swap

After installing a new cell, the PSP7501 DUO may shut down abruptly when the percentage display still shows 20–30% remaining. The fuel gauge IC's coulomb counter is still calibrated to the old cell's discharge curve, so it misjudges how much charge is left. When the modem fires up for a call or data burst, current draw spikes and the new cell's voltage drops faster than the IC expects — hitting the low-voltage cutoff before the percentage reaches zero. One full uninterrupted discharge-to-shutdown followed by a full charge corrects the coulomb counter and eliminates these early cutoffs.

Phone warm near the battery compartment during the first charge

A new cell starts with higher internal impedance than a conditioned one. The charge IC pushes current into a cell it hasn't characterised yet, which produces more heat at the cell surface than users are used to seeing with the old battery. This is normal during the first one or two charge cycles as impedance drops. If warmth continues past the third full charge or the phone becomes hot to the touch, check that the charge IC isn't stuck in a high-current phase — connect to a standard 5V/1A charger rather than a fast charger for the first cycle.