The Walkman does not fully charge when connected to the Speaker.
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If the AUTO STANDBY feature of the Speaker System is set to ON, the speaker will automatically turn off when being in silent and inactive for about 20 minutes.
If the Walkman is connected to the Speaker System while charging and the speaker goes into AUTO STANDBY mode, the charging will stop as well.
To avoid this, set the AUTO STANDBY of the Speaker System to OFF.