JBL Battery 400 Spare Battery - Compatible with The JBL PartyBox Stage 320 and Xtreme 4 Portable Speaker (Speaker Sold Separately) Q1 Yamaha Proprietary Sound Processing

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JBL Battery 400 Spare Battery - Compatible with The JBL PartyBox Stage 320 and Xtreme 4 Portable Speaker (Speaker Sold Separately) Q1 Yamaha Proprietary Sound ProcessingPrice Match Guarantee JBL Battery 400 Spare Battery Compatible with The JBL PartyBox Stage 320 and Xtreme 4 Portable Speaker (Speaker Sold Separately) The JBL Battery 400 is an external battery designed to extend the playtime of compatible JBL speakers. Here's a breakdown of its key features: Double the Playtime: Each battery provides up to 18 hours of additional playtime for your speaker, effectively doubling the total playtime on a single charge.