JBL Battery 400 68Wh Replacement Battery for Stage 320 and Xtreme 4

JBL Battery 400 68Wh Replacement Battery

The JBL Battery 400 is a 68Wh rechargeable lithium-ion replacement battery designed specifically for the JBL PartyBox Stage 320 and JBL Xtreme 4. Its removable design allows compatible speaker owners to swap batteries in seconds, extending portable operation without waiting for the installed battery to recharge.

With a rated capacity of 7.2V, 9444mAh, and 68Wh, the Battery 400 is built for parties, outdoor events, mobile entertainment, travel, and other applications where longer untethered speaker operation is important. In the PartyBox Stage 320, one Battery 400 provides up to 18 hours of playtime, allowing a charged spare to substantially extend an event.

JBL also supports fast charging with compatible PartyBox Stage 320 and Xtreme 4 speakers, providing up to two additional hours of playback from a 10-minute charge. The official replacement battery weighs just 0.8 lb and uses model FG4CELL21700G. JBL explicitly limits Battery 400 compatibility to the PartyBox Stage 320 and Xtreme 4, helping buyers avoid incompatible batteries from other PartyBox or portable-speaker models.

Key Features

• 68Wh Rechargeable Battery: Provides 7.2V and 9444mAh of lithium-ion capacity for compatible JBL portable speakers.
• Quick Battery Replacement: Slides into the compatible speaker battery compartment in seconds for convenient swaps during extended use.
• Up to 18 Hours of Playtime: Provides up to 18 hours of operation per battery when used with the JBL PartyBox Stage 320.
• Fast-Charge Support: A 10-minute fast charge can provide up to two additional hours of playtime with compatible Stage 320 and Xtreme 4 speakers.
• Two-Model Compatibility: Designed specifically for the JBL PartyBox Stage 320 and JBL Xtreme 4.
• Replacement for Aging Batteries: Can replace the rechargeable battery in an Xtreme 4 when its original battery performance declines.
• PartyBox App Monitoring: Compatible PartyBox Stage 320 users can monitor battery health through the JBL PartyBox app.
• Portable Spare Power: Weighs only 0.8 lb, making it easy to carry as a backup for mobile speaker applications.

Extend PartyBox Stage 320 Playtime

A spare Battery 400 gives PartyBox Stage 320 users a practical way to extend portable playback during longer events. JBL rates each battery for up to 18 hours of playtime, allowing users to replace a depleted battery with a charged spare rather than stopping the event while the first battery recharges.

Fast Charging for Compatible JBL Speakers

The Battery 400 supports JBL's fast-charge workflow when installed in compatible equipment. A 10-minute charge can provide up to two additional hours of playback with the PartyBox Stage 320 or Xtreme 4, which is useful when only a short charging window is available.

Official Stage 320 and Xtreme 4 Compatibility

JBL specifically identifies the Battery 400 for the PartyBox Stage 320 and Xtreme 4. Other PartyBox and JBL portable speaker models can use different battery designs, so Battery 400 should not be treated as a universal replacement battery across the JBL speaker lineup.

Compact 68Wh Lithium-Ion Design

The FG4CELL21700G lithium-ion battery provides 68Wh of energy from a compact enclosure measuring approximately 3.7" wide, 1" high, and 3.5" deep. At only 0.8 lb, it can be carried as a spare without adding substantial weight to a portable speaker setup.

Technical Specifications

• Brand: JBL
• Product Name: Battery 400
• Item Number: JBLBATTERY400AM
• Battery Model Name: FG4CELL21700G
• Product Type: Rechargeable Replacement Speaker Battery
• Color: Black
• Battery Type: Lithium-ion
• Battery Capacity: 7.2V / 9444mAh / 68Wh
• Compatible Speakers: JBL PartyBox Stage 320 and JBL Xtreme 4
• PartyBox Stage 320 Playtime: Up to 18 hours per battery
• Fast-Charge Performance: 10-minute charge provides up to 2 additional hours of playtime with PartyBox Stage 320 and Xtreme 4
• Operating Temperature: 0 to 45°C
• Dimensions: 3.7" W x 1" H x 3.5" D
• Weight: 0.8 lb
• Packaging Dimensions: 4.3" W x 4" H x 1.4" D
• Gross Weight: 0.9 lb
• EAN: 1200130013782
• Packaging: FSC-certified packaging printed with soy ink

What's In the Box

• JBL Battery 400
• Quick Start Guide
• Safety Instruction and Warranty Card