The JBL Battery 400 is JBL’s replaceable battery pack for its swappable-battery speakers. JBL’s product page lists the PartyBox Stage 320 and the Xtreme 4, and JBL’s own battery compatibility guide adds the Xtreme 5 and the Bandbox Trio. With a second JBL Battery 400 charged and ready, you swap packs when the first runs down instead of stopping the music to look for a socket. It is a 7.2V, 9444mAh lithium-ion pack rated at 68Wh.
Table of Contents
Which Speakers the JBL Battery 400 Fits
JBL’s Battery 400 product page and spec sheet name two speakers: the JBL PartyBox Stage 320 and the JBL Xtreme 4. JBL’s support article on battery and charger compatibility lists four models for the JBL Battery 400: PartyBox Stage 320, Xtreme 4, Xtreme 5 and Bandbox Trio.
The same guide shows which JBL speakers need a different pack. The PartyBox On The Go 2, PartyBox Encore 2 and PartyBox Club 120 use the Battery 200. The Boombox 4, PartyBox 520 and PartyBox 720 (which takes two) use the Battery 600. If your speaker is not on the Battery 400 list, this pack will not fit it.
Playtime: What 18 Hours Means
JBL states that each JBL Battery 400 holds enough power for up to 18 hours of playtime, and that two batteries can keep a party going for up to 36 hours. JBL does not break this figure down by speaker, and real playtime depends on volume, bass level and, on the PartyBox, how much of the light show you run. Loud outdoor sessions will use the battery faster.
For the PartyBox Stage 320 and Xtreme 4, JBL adds that a 10-minute fast charge gives an extra 2 hours of playtime.
How the Swap Works
The JBL Battery 400 is built for a tool-free hot swap: open the battery compartment on the speaker, slide the pack out, slide a charged one in, and carry on. The battery charges while it sits inside a compatible speaker. JBL also sells a separate Battery 400 with Charging Case bundle for charging a spare outside the speaker; this listing is the battery on its own.
The JBL PartyBox App shows the battery’s state of health, so you can see how the pack is ageing over time and decide when it is due for replacement.
A Longer Life for Your Speaker
Every lithium-ion battery loses capacity after hundreds of charge cycles. On a speaker with a sealed battery, that is the point where the whole speaker starts to feel tired. With a swappable design, you replace the JBL Battery 400 and the speaker gets its full runtime back. JBL presents the Battery 400 as a way to replace a worn pack in a compatible speaker, and ships it in FSC-certified packaging printed with soy ink.
Physical Details and Care
The pack measures 93 x 25.1 x 89.5 mm and weighs 350 g, so a spare fits in a backpack pocket. JBL’s model number for the cell pack is FG4CELL21700G, and its operating temperature range is 0 to 45°C. In the UAE summer that upper limit matters: do not leave a spare battery in a parked car or on a sunny beach bag, and store it in the shade when you are outdoors.
Who This Is Not For
Owners of the PartyBox Club 120, Encore 2 or On The Go 2 need the Battery 200 instead, and PartyBox 520, 720 and Boombox 4 owners need the Battery 600. No external charger is included, so a spare can only be charged inside a compatible speaker unless you buy JBL’s charging-case bundle. And if you rarely play for more than one battery’s worth, a spare adds weight to carry without much gain; it makes most sense for long events, camping trips or as a replacement for an ageing pack.
Buy the JBL Battery 400 in the UAE
We sell the genuine JBL Battery 400 with a 1-year warranty from Totot. Delivery across the UAE takes up to 3 business days and is free on orders from AED 300. Items that arrive defective or not as described can be returned within 14 days, and shipping damage should be reported within 48 hours of delivery.
Technical Specifications
- Model: JBL Battery 400 (cell pack FG4CELL21700G)
- Compatible speakers: JBL PartyBox Stage 320 and Xtreme 4 (JBL product page); Xtreme 5 and Bandbox Trio also listed in JBL’s support compatibility guide
- Battery type: Lithium-ion
- Capacity: 7.2V / 9444mAh, 68Wh
- Playtime: Up to 18 hours per battery, up to 36 hours with two (JBL; varies with volume and lighting)
- Fast charge: 10 minutes gives an extra 2 hours on the PartyBox Stage 320 and Xtreme 4
- Charging: Inside a compatible speaker; no external charger included
- Battery health: State of health shown in the JBL PartyBox App
- Operating temperature: 0 – 45°C
- Dimensions: 93 x 25.1 x 89.5 mm
- Weight: 350 g net
- In the box: 1 x Battery 400, quick start guide, safety instruction and warranty card
- Warranty: 1-year warranty from Totot
Specifications come from JBL’s official Battery 400 page and spec sheet; the extended compatibility list comes from JBL’s support article on battery and charger compatibility. Full details are published on the JBL battery compatibility guide.
FAQ
Which speakers does the JBL Battery 400 fit?
4 models according to JBL support: PartyBox Stage 320, Xtreme 4, Xtreme 5 and Bandbox Trio.
Does it fit the PartyBox Club 120 or Encore 2?
No. JBL lists the Battery 200 for the PartyBox Club 120, Encore 2 and On The Go 2.
How long does one JBL Battery 400 last?
18 hours at most, per JBL; real playtime depends on volume, bass and lighting.
Can I charge it without the speaker?
No, not with this listing: it charges inside a compatible speaker. JBL sells a separate Battery 400 with Charging Case bundle for that.
Do I need tools to swap it?
No. The swap is tool-free: open the compartment, slide the old pack out and the new one in.
What is the capacity?
68Wh (7.2V / 9444mAh), according to JBL.
Can I check the battery’s condition?
Yes. The JBL PartyBox App shows the battery’s state of health.
Browse more in our Chargers & Power Adapters range. Every order from Totot carries a 1-year warranty covering manufacturing defects, with our 14-day return policy for defective or non-compliant items, and nationwide UAE delivery.
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