Medion SV10B Replacement Battery 3.7V 950mAh Li-ion

Medion Smartphone — 3.7V Li-ion Replacement Battery (SV10B / SV16A)

This 3.7V Li-ion cell at 950mAh (3.52Wh) replaces the SV10B and SV16A batteries used in Medion smartphones. When the original cell degrades, charge retention drops sharply and the phone becomes unreliable for daily use. Swapping to a fresh cell restores normal voltage delivery across all system loads.

• SV10B and SV16A cross-compatibility: Both part numbers share the same 3.7V nominal voltage rail and connector pinout on the affected Medion handsets. Either can be swapped without rewiring or adapting the charge circuit.
• Bench tested on actual hardware: We cycled this cell through charge and load discharge on a Medion smartphone platform. The BMS accepted charge handshake correctly and held voltage within spec under screen and modem load without false cutoff.
• 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 pushes current into an uncalibrated cell.

Sudden shutdown at 20–30% on the replacement cell

A fresh cell has a discharge curve the phone's fuel gauge IC has never seen. When the modem or display draws a current spike, the cell voltage dips briefly below the BMS cutoff threshold — even though the gauge still shows charge remaining. The phone interprets this as a critical low-voltage event and shuts down to protect the circuit. Run one full discharge to below 5% and a full charge without interruption. After that single cycle the coulomb counter recalibrates and shutdown at 20–30% stops.

Phone won't power on after the battery sat discharged in storage

Li-ion cells that drop below approximately 2.5V per cell trigger a BMS lockout — the protection circuit opens and blocks current flow entirely. Plugging in a charger appears to do nothing because the BMS won't pass current until the cell reaches a recovery threshold. Use a charger that supports trickle or pre-charge mode and leave it connected for at least 20–30 minutes without pressing the power button. Once the cell recovers to around 3.0V the BMS re-closes and normal charging resumes.