Upgrade your PartyBox Stage 320 or Xtreme 4 Portable Speaker with this high-performance replacement battery, designed to keep the music playing longer and louder. Compatible with both models, this durable battery ensures seamless power delivery, so you can enjoy uninterrupted sound at parties, outdoor events, or on-the-go adventures. It features a reliable lithium-ion design for extended battery life and fast charging. Easy to install, this replacement battery is perfect for reviving your speaker's performance when the original battery starts to fade. Whether you're hosting a party or exploring the outdoors, this battery ensures your speaker stays powered and ready to deliver the signature bass-driven sound you love. Keep the beats going with this essential upgrade!