What does the flashing red LED indicator mean on the PartyBox 310?
A quickly flashing red LED indicates that the battery is low. You can check the battery level at any time by pressing any button on the speaker. It is recommended to fully charge the speaker before first-time use to prolong the lifespan of the built-in battery. (Page 7, 9)
From the official Jbl Partybox 310mc Portable Party Speaker manual, page 7
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