About this replacement
Prestigio PSP7510 DOU / Muze C7 Duo — 3.82V Li-Polymer Replacement Battery (PSP7510 DOU)
This is a 3.82V, 4900mAh Li-Polymer battery for the Prestigio PSP7510 DOU and Muze C7 Duo smartphones. It replaces the original cell when capacity has degraded or the battery has failed outright. Voltage and capacity match OEM spec at 3.82V and 18.72Wh.
- PSP7510 DOU and Muze C7 Duo compatibility: Both devices share the same battery bay geometry, connector pinout, and BMS handshake protocol — the same 3.82V cell fits both without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the PSP7510 DOU platform. The BMS accepted the cell on first connection, thermistor reads tracked correctly, and charge IC terminated at the expected cutoff voltage without error flags.
- Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one full discharge-to-charge cycle before enabling it again. The fuel gauge IC on the PSP7510 DOU is calibrated to the old cell's discharge curve — one slow cycle lets it re-map against the new cell before high-current charging begins.
Sudden shutdown at 20–30% on the PSP7510 DOU after a cell swap
This happens because the fuel gauge IC still holds the discharge curve of the old, degraded cell. When the new cell hits a voltage the old curve associated with 20–30%, the OS treats it as a low-voltage emergency and shuts down — even though real charge remains. The fix is one full, uninterrupted discharge down to auto-shutdown followed by a complete charge to 100%. After that cycle, the coulomb counter recalibrates and percentage reporting stabilises.
Phone warm near the battery during the first few charges after replacement
A fresh Li-Polymer cell has higher internal impedance than a broken-in cell. The charge IC pushes the same current into a higher-resistance load, and that resistance converts some energy to heat. This is normal for the first two to three charge cycles and fades as the cell's impedance drops. If warmth persists beyond the third full charge or the device feels hot rather than warm, check that the charge IC is not locked in a high-current fast-charge mode — drop it to standard 5V charging and confirm the back of the phone returns to ambient temperature within ten minutes of charging starting.