Replacement Battery for JBL Boombox 4 Speaker
Power your JBL Boombox 4 with this high-capacity replacement battery pack, sharing the same battery as the PartyBox 520.
Battery Specifications
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Compatible Model: JBL Boombox 4 (shares battery with PartyBox 520)
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Part Number: FG6CELL21700G
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Voltage: 21.6V
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Capacity: 5000 mAh / 108 Wh
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Battery Type: Lithium-ion (Li-ion)
Key Features
- ✓ Built-in BMS Protection — overcharge, over-discharge, overheat & short-circuit protection
- ✓ Direct Drop-In Fit — matches original specifications exactly
- ✓ Premium Li-ion Cells — stable voltage, long cycle life
- ✓ 100% Tested Before Dispatch — quality verified at BatteryWorks
- ✓ Cost-Effective Repair — restore your speaker for a fraction of replacement cost
Why BatteryWorks?
BatteryWorks India specialises in replacement batteries for JBL, Bose, Bang & Olufsen, Harman Kardon and other premium audio brands. Every battery is certified, tested and ready to install.
