Prestigio Multipad 7.0 Ultra Duo 3.7V Compatible Battery 3871A2

Prestigio Multipad 7.0 Ultra Duo — 3.7V Li-Polymer Replacement Battery (3871A2)

This 3.7V, 3000mAh Li-Polymer battery replaces the OEM 3871A2 cell in the Prestigio Multipad 7.0 Ultra Duo (PMT5877C). It fits the 7-inch Android tablet directly, restoring power to units where the original cell no longer holds a charge or fails to boot the device. Capacity is 3000mAh (11.1Wh), matching the original specification.

• Multipad 7.0 Ultra Duo and PMT5877C fitment: Both model designations use the same physical cell format, connector pinout, and charge IC handshake — the 3871A2 part number covers the full run of this tablet variant without hardware modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the PMT5877C platform. The BMS accepted the new cell on first connection, charge IC engaged correctly, and no false low-voltage cutoff events occurred under combined Wi-Fi and display load.
• Fuel gauge recalibration after swap: After fitting this battery, run the tablet down to automatic shutoff from a full charge, then charge uninterrupted to 100% without interruption. This forces the fuel gauge IC to recalibrate against the new cell and clears the inaccurate percentage readings that commonly appear after a cell replacement.

Tablet shutting down at 15–25% remaining after battery replacement

This happens when the fuel gauge IC is still mapped to the voltage curve of the old, degraded cell. The new cell has a steeper voltage drop at low state-of-charge, and the IC interprets that curve as an emergency cutoff threshold. The tablet shuts down before the battery is actually empty. One complete discharge-to-shutoff followed by an uninterrupted charge to 100% resets the calibration — after that cycle, the shutoff point moves back to the correct threshold near 3.0V per cell.

Fast charging not available after fitting the replacement cell

The Multipad 7.0 Ultra Duo charge controller negotiates charge rate based on a recognised cell profile. On the first cycle with a new cell, the IC defaults to a conservative charge rate until it completes one full accepted charge cycle. This is a protection behaviour, not a fault. Charge the tablet fully from flat once using the original charger — on the second cycle, the charge rate returns to the standard accepted level.