About this replacement
Prestigio MultiPhone 4300 Duo — 3.7V Li-ion Replacement Battery (PAP4300DUO)
This is a 3.7V, 1500mAh Li-ion cell built to replace the original battery in the Prestigio MultiPhone 4300 Duo dual-SIM smartphone. It matches the OEM part number PAP4300DUO and fits the 62.42 × 47.21 × 5.02mm battery cavity. Capacity is rated at 5.55Wh, identical to the factory specification.
- MultiPhone 4300 Duo fitment: The 4300 Duo runs two active SIM radios simultaneously, which places a higher average current draw on the cell than a single-SIM device. This replacement cell matches the original's connector pinout and BMS communication protocol so both SIM slots remain active without triggering a low-voltage cutoff event under dual-radio load.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge on the MultiPhone 4300 Duo platform. The BMS accepted the new cell without a handshake error, and the charge IC ran a standard CC/CV profile to 4.2V termination without interruption.
- Fuel gauge recalibration on first use: After fitting this cell, disable fast charging and run one complete discharge down to automatic shutdown, then charge uninterrupted to 100%. This gives the fuel gauge IC a full reference curve against the new cell before the OS begins using stored capacity estimates for display and cutoff decisions.
Sudden shutdown at 20–30% on the replacement cell
This is the most common issue reported after fitting a new cell into a device whose fuel gauge IC was calibrated to a degraded original battery. The OS calculates remaining capacity using a stored discharge curve from the old, worn cell. When the new cell's actual voltage drops below roughly 3.6V under modem load, the hardware protection circuit cuts out even though the percentage display still reads 20–30%. One full uninterrupted discharge-charge cycle rewrites the reference data the coulomb counter uses. After that cycle, reported percentage and actual cell voltage align correctly.
Device not powering on after the battery sat in storage
Li-ion cells self-discharge during storage, and if the cell voltage has dropped below approximately 2.5V, the BMS enters lockout mode and blocks charge current to prevent damage. The phone will show no response when plugged in — no charging indicator, no boot screen. Connect the device to a wall charger rated at 5V and leave it untouched for 20–40 minutes; the BMS uses a low-current trickle path to recover cell voltage before opening the main charge circuit. Once voltage climbs above 3.0V, the BMS re-enables normal charging and the device will power on.