The JBL Battery 400 is an official, easily swappable Lithium-ion battery designed for the JBL PartyBox Stage 320 and Xtreme 4 speaker, offering up to 18 hours of playtime per charge. It enables quick replacements in seconds, allowing for a total of 36 hours of playtime (when using two batteries), and supports fast charging, with 10 minutes providing 2 extra hours of play.
