Medion 50077078 Replacement Battery 7.4V 6700mAh

Medion LIFE P61762 / 50077078 — 7.4V Li-ion Replacement Battery (2ICR19/66-2)

This is a 7.4V, 6700mAh (49.58Wh) Li-ion replacement battery for the Medion LIFE P61762 and 50077078 portable Bluetooth speakers. It uses OEM part number 2ICR19/66-2 and slots into the same position as the factory cell. If your speaker no longer holds a charge or dies well before the indicator reaches empty, this battery addresses the source.

• LIFE P61762 and 50077078 compatibility: Both models share the same 7.4V dual-cell configuration, connector pinout, and BMS handshake protocol. A battery pulled from one will work in the other — the fuel gauge logic and charge termination thresholds are identical across this speaker line.
• Bench tested on actual hardware: We ran the 2ICR19/66-2 cell through full charge cycles on a LIFE P61762 unit. The BMS accepted charge without fault flags, balancing kicked in at 4.18V per cell, and the speaker's charge indicator tracked correctly from 0% to 100% through three consecutive cycles.
• Monthly discharge cycle for LIFE P61762 users: If you use this speaker at your desk and top it off before it drops below 50%, do a full discharge to under 20% at least once a month before recharging. Constant shallow cycling causes fuel gauge drift on this battery's BMS, making the speaker shut off well before the indicator shows low.

Audio distorting before the battery indicator reaches empty on the P61762

The P61762's amplifier stage draws a sharp current spike when pushing high volume, and an aged or shallow-cycled cell can't sustain the rail voltage under that load. Voltage sags below the amplifier's clean operating threshold before the battery gauge registers critical. The speaker distorts — clipping the audio — while the LED still shows two or three bars. A new 6700mAh cell with full capacity restores the headroom the amplifier needs to stay clean through the discharge curve.

Speaker won't wake from USB charging after sitting unused for weeks

If the P61762 sits uncharged for an extended period, the cell can drop below the USB-C PD minimum acceptance voltage — typically around 2.5V per cell on this pack. At that point the charger handshake fails and the speaker appears completely dead. Connect it to a 5V USB-A port rather than a USB-C PD charger — the lower-voltage source can sometimes trickle enough current past the BMS protection threshold to begin recovery. Once the cell climbs above 3.0V per cell, switch to the standard charger and let it complete a full cycle.