Medion 50077078 Replacement Battery 7.4V 5200mAh

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

This is a 7.4V, 5200mAh (38.48Wh) Li-ion replacement battery for the Medion LIFE P61762 portable Bluetooth speaker, also listed under model number 50077078. It uses OEM part number 2ICR19/66-2 and matches the original cell format at 67.00 x 39.40 x 38.60mm. Fit this when the original pack no longer holds a charge or cuts out mid-session.

• LIFE P61762 and 50077078 compatibility: Both model numbers refer to the same Medion portable speaker platform. They share the same battery bay dimensions, connector pinout, and BMS handshake requirements — this cell satisfies all three.
• Bench tested on actual hardware: We ran the pack through charge and discharge cycles on the P61762 platform. The BMS accepted the cell without fault codes, protection circuits triggered correctly at low-voltage cutoff, and the fuel gauge tracked accurately across the discharge curve.
• Monthly discharge cycle for P61762 users: This speaker is commonly left on a desk and topped off before it drops below 50%. Do that daily and the fuel gauge drifts within a few months. Run it below 20% at least once a month before recharging to recalibrate the gauge and slow capacity fade on the Li-ion cells.

Audio distorting before the battery indicator reaches empty on the P61762

The P61762 amplifier draws a hard current spike at high volume. When the cell voltage sags under that load, the amp hits its minimum supply voltage and clips the audio signal before the battery indicator registers low. This is voltage sag under peak draw — not a faulty battery. The BMS hasn't triggered, but the amp is already starved. If distortion starts appearing at medium-to-high volume, check cell voltage under load — anything below 6.8V under the amplifier's peak draw points to a degraded or deeply discharged cell that needs replacement.

Speaker shows full charge on a new battery but audio cuts after extended play in a fabric case

The P61762 encloses both the amplifier board and the battery in a compact fabric housing with limited airflow. Under extended playback, amplifier heat and discharge heat from the Li-ion cells combine and raise the battery's internal temperature. Once the BMS detects that threshold, it throttles output or triggers a protective cutoff — the speaker goes quiet even though the charge indicator still reads high. Let the unit cool for ten minutes with the fabric cover open, then resume playback at a lower volume to stay below the thermal trip point.