Features:

• Compatible with JBL PartyBox Stage 320 and Xtreme 4: JBL Battery 400 is only compatible with the JBL PartyBox Stage 320 and JBL Xtreme 4 wireless Bluetooth speaker. Other JBL PartyBoxes and JBL portables have different battery requirements.
• Keep the party going twice as long by having a spare JBL Battery 400 on hand: Just swap out the battery in the back of your JBL PartyBox Stage 320. Each battery has up to 18 hours of playtime, which means you could keep the party going for up to 36 hours.
• Guaranteed JBL Quality: Give yourself the peace of mind that comes from a trustworthy, reliable JBL Battery 400 that’s guaranteed to work with your speaker.
• Fast charge: 10 minutes fast charge will give your JBL PartyBox Stage 320 and Xtreme 4 an extra 2 hours of playtime.
• Monitor playtime in the JBL PartyBox App Just use your JBL PartyBox app to check the health of your JBL PartyBox Stage 320s current battery. When the Battery State of Health (SOH) reading lets you know its time, replacing the battery takes just seconds.