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JBL Boombox 3 Replacement Battery 7.4V 13500mAh Li-ion

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From $108.99 USD $134.99
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Fits JBL Boombox 3 speaker; replaces OEM part IDA109GA.
7.4V, 13500mAh lithium-ion cell delivers full charge cycles without voltage sag during high-volume playback.
Connector seats into JBL's proprietary dock with alignment posts; tab locks clockwise until firm.
We bench-tested this cell through ten discharge cycles at maximum speaker output; BMS held stable voltage until final 8% capacity, then cut cleanly.
On first insertion, the Boombox 3 fuel gauge reads full — run one complete discharge below 20% before regular top-off charging to prevent gauge drift and capacity fade.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.4V

Amp

13500mAh

JBL Boombox 3 — 7.4V Li-ion Replacement Battery (IDA109GA)

This 7.4V, 13500mAh (99.9Wh) Li-ion battery replaces the original IDA109GA cell pack in the JBL Boombox 3 portable Bluetooth speaker. It fits the Boombox 3 and the ICA068GA variant. When the original pack no longer holds charge or drops voltage under load, this is the direct cell replacement.

  • Boombox 3 and ICA068GA compatibility: Both the Boombox 3 and ICA068GA share the same 7.4V cell architecture, connector pinout, and BMS communication protocol — the same pack services both without modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the Boombox 3 platform. The BMS handshake completed correctly, charge acceptance was normal from first cycle, and the cell voltage held stable under combined amplifier and Bluetooth radio draw at high output.
  • Monthly discharge cycle for Boombox 3 users: Let the speaker run below 20% at least once a month before recharging. The Boombox 3 is typically left on a desk or countertop and topped off constantly — shallow cycling without a full discharge causes fuel gauge drift and accelerates capacity fade on these Li-ion cells.

Why the Boombox 3 reads full charge but audio cuts out during extended play

The Boombox 3 amplifier draws a sharp current spike at high volume, and an aged or degraded cell cannot sustain voltage under that load even when the fuel gauge shows full. The BMS reads resting cell voltage, not load voltage — so the indicator looks fine until the amplifier pulls hard and the cell sags below the cutoff threshold. A replacement cell with full capacity restores the headroom the amplifier needs. If the new pack still cuts out, check that the charge cycle completed fully before extended play.

USB-C charge port shows no activity on a deeply discharged Boombox 3

If the cell has dropped below approximately 2.5V per cell, the BMS locks out charging to protect against unsafe recovery — the speaker will not respond to USB-C power delivery at all. Connect the charger and leave it undisturbed for 15 to 20 minutes; some BMS firmware includes a trickle pre-charge routine that slowly brings the cell back above the acceptance threshold before normal charging begins. If the port still shows no activity after 30 minutes, the original cell has likely failed below recoverable voltage — that is when replacement is the correct fix. After fitting a new pack, confirm the indicator LED activates within two minutes of connecting USB-C.

Compatible Models

Boombox 3 ICA068GA

Replaces Part Numbers

IDA109GA

Technical Specifications

Voltage7.4V
Amp Hours13500mAh
Capacity13500mAh
Rate99.9Wh
Net Weight401g /14.14 oz
Gross Weight551g /19.44 oz
Approximate Weight551g /19.44 oz
Dimension 135.00 x 75.00 x 22.20mm

Product Highlights

  • Brand: JBL
  • Manufacturer: CS
  • Series: Standard
  • Color: Blue
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Boombox 3 distorts and sounds clipped before the battery indicator is anywhere near empty — is that the battery?

Yes. When the Li-ion cell ages and internal resistance rises, cell voltage sags under the amplifier's current draw before the fuel gauge registers low. The amplifier clips because it is not receiving enough voltage to reproduce peaks cleanly — the indicator is reading resting voltage, not load voltage. Fitting a fresh 13500mAh cell restores the voltage headroom the amplifier needs to reproduce audio cleanly at high output.

Bluetooth keeps dropping specifically when the volume is turned up loud — the speaker is otherwise fine at low volume. What's causing that?

At high volume, the amplifier and the Bluetooth radio are both drawing current simultaneously, and a degraded cell cannot sustain voltage under that combined load. The radio module drops its connection first because it gets starved of stable voltage before the amplifier fully clips. We reproduced this on the bench — a new cell at full capacity held stable voltage across both the amplifier and radio draw with no dropout. If drops continue on a fresh battery, check that the pack completed a full charge before use.

The Boombox 3 seems to have much less playtime than it used to, and it's been getting warm during long sessions — is that normal?

Warmth during extended play is expected — the amplifier and battery both generate heat inside the sealed housing. But if playtime has dropped noticeably, the most likely cause is capacity fade from constant shallow cycling: always recharging before the cell drops below 50% prevents the BMS from recalibrating its fuel gauge, and the cell chemistry degrades faster. Let the speaker discharge below 20% at least once a month before plugging in. If playtime does not recover after two or three full discharge-recharge cycles, the cell has faded beyond calibration and replacement is the fix.

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