Medion Life P4012 Replacement Battery 3.8V 1950mAh

Medion Life P4012 (MD98911) — 3.8V Li-ion Replacement Battery

This 3.8V, 1950mAh Li-ion cell replaces the original battery in the Medion Life P4012 (also sold as MD98911). It fits directly into the P4012 chassis without modification. Capacity figures are taken from verified product data — 1950mAh at 7.41Wh.

• P4012 / MD98911 compatibility: Both model numbers refer to the same handset hardware. The P4012 and MD98911 share an identical battery bay geometry, connector pitch, and BMS handshake voltage — a single cell covers both variants.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the P4012 platform. The BMS accepted charge current without fault flags, and the protection circuit tripped correctly at the low-voltage cutoff threshold — no runaway charge behaviour observed.
• Fuel gauge recalibration on first use: After fitting this cell, disable any fast-charge mode and run one complete discharge-charge cycle at standard current. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging is applied to an uncalibrated reference point.

Sudden shutdown at 20–30% on the P4012 after a cell swap

The P4012's fuel gauge IC was calibrated against the original cell's discharge curve. A new cell with a slightly different internal resistance profile causes the IC to misread the remaining charge — it reports 25% but the actual terminal voltage has already dropped below the modem's minimum rail. When the screen and LTE radio draw current simultaneously, voltage sags past the cutoff point and the phone shuts down instantly. One full discharge-charge cycle at standard current resets the coulomb counter and corrects the percentage readout.

Phone feels warm near the battery during the first few charges

A new Li-ion cell typically has higher internal impedance than a conditioned cell that has completed several cycles. The charge IC on the P4012 pushes current into this higher-impedance cell, which converts more energy to heat during the first two or three sessions. This is normal and tapers off as the cell's impedance drops with cycling. If the phone still runs noticeably warm after five full charge cycles, check that the battery connector is fully seated — a partial connection increases resistance further and extends this warm-in period.