Medion 50077082 Portable Speaker Replacement Battery 10.8V 7800mAh

Medion LIFE P61768 Series — 10.8V Li-ion Replacement Battery (3ICR19/66-3)

This 10.8V, 7800mAh Li-ion battery replaces the original pack in the Medion 50077082, LIFE P61746, LIFE P61762, and LIFE P61768 portable Bluetooth speakers. All four models share the same 3ICR19/66-3 cell configuration and BMS pinout. Capacity is rated at 84.24Wh.

• LIFE P61746, P61762, P61768 and 50077082 compatibility: These speakers run on the same 3S Li-ion cell arrangement and use the same BMS handshake protocol. Swapping the pack across any of these four models does not require firmware changes or connector adapters.
• Bench tested on actual hardware: We cycled this pack through a full charge-discharge sequence while monitoring the BMS under combined Bluetooth radio and amplifier draw. The protection circuit held cutoff at the correct low-voltage threshold and balanced all three cell groups within 20mV at top-of-charge.
• Fuel gauge reset after fitting: These Medion speakers use a coulomb-counter fuel gauge that carries over state-of-charge data from the old pack. After fitting this battery, run a full discharge to the auto-shutoff point, then charge uninterrupted to 100%. This resets the gauge baseline and prevents the indicator from reading incorrectly.

Audio distortion before the battery indicator reaches empty

As an aged Li-ion pack loses capacity, internal resistance climbs. Under the combined current draw of the amplifier and Bluetooth radio at high volume, pack voltage sags below the amplifier's clean-rail threshold before the BMS reaches its cutoff point. The amplifier clips the signal rather than shutting down, so you hear distortion while the indicator still shows charge remaining. Fitting a fresh pack with lower internal resistance eliminates the sag and restores clean output down to the BMS cutoff at approximately 9.0V.

Bluetooth dropping at high volume on a new or recently replaced battery

A Bluetooth dropout during loud playback is not a pairing fault — it is a voltage event. Peaks in amplifier demand at high volume create short current spikes that momentarily drag pack voltage down. If the BMS interprets that sag as an under-voltage condition, it briefly interrupts output, which resets the Bluetooth radio. To confirm this is the cause, lower volume by 20% and check whether dropouts stop. If they do, check that the replacement pack is fully charged to 12.6V before extended high-volume use, as a partially charged pack has less voltage headroom to absorb those spikes.