About this replacement
Medion Life E4502 — 3.7V Li-ion Replacement Battery (LI37163A1)
This 3.7V, 1700mAh Li-ion battery is a direct cell replacement for the Medion Life E4502 smartphone and the MD 98907 / MD98907 variants. It also fits the Life P4013. Voltage and capacity match the OEM specification exactly — 3.7V nominal, 6.29Wh total.
- Life E4502 / MD 98907 / Life P4013 compatibility: These models share the same cell footprint, connector pinout, and BMS communication lines, which is why a single SKU covers the full group. Swapping between them does not require firmware changes.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the E4502 platform. The BMS accepted the cell without error flags, and charge termination triggered correctly at full capacity.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging is applied to an uncalibrated cell.
Sudden shutdown at 20–30% on the replacement cell
A fresh cell has a different discharge curve than the worn cell the fuel gauge IC was calibrated against. When the modem fires or the screen peaks in brightness, instantaneous current demand causes a voltage sag the fuel gauge did not predict. The IC reads the sag as a hard undervoltage event and shuts the device down, even though displayed percentage suggests charge remains. One full discharge-to-cutoff and recharge cycle re-trains the coulomb counter to the new cell, and premature shutdowns stop.
Phone will not power on after sitting discharged in storage
Li-ion cells stored at very low state of charge can drop below 2.5V per cell, triggering a BMS lockout that blocks normal boot. The device will show no signs of life even when connected to a charger. Connect the phone to a wall adapter — not a USB port — and leave it undisturbed for 20–30 minutes before pressing the power button. If the cell recovers above 2.8V, the BMS releases the lockout and the phone boots normally.