JBL Battery 400 for JBL PartyBox Stage 320

Keep the party going twice

The JBL Battery 400 is an official, easy-to-replace spare rechargeable battery designed specifically for the JBL PartyBox Stage 320 portable party speaker (and compatible with the JBL Xtreme 4), allowing users to extend playtime significantly without interruptions. With a capacity that delivers up to 18 hours of additional playback per charge, swapping in a fresh Battery 400 when the original runs low can double the total party time to up to 36 hours. It features fast charging— just 10 minutes provides an extra 2 hours of playtime—and quick hot-swap installation via the dedicated slot on the back panel. Monitor battery health conveniently through the JBL PartyBox app, ensuring reliable performance with genuine JBL quality for uninterrupted music, lights, and bass during outdoor events, gatherings, or extended sessions.