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JBL PartyBox 100 Replacement Battery 14.4V 3400mAh SUN-INTE-260

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From $73.99 USD $91.99
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Fits JBL PartyBox 100 and R21-5 models, replaces SUN-INTE-260 and DH14026CHM battery packs.
14.4V 3400mAh cell delivers the voltage and capacity the PartyBox 100 amplifier needs for full playback cycles.
Connector seats into the battery compartment with a locking tab that engages on insertion and release.
We bench tested this pack through discharge under sustained audio load — BMS held steady voltage curve with no dropout.
Discharge the speaker below 20% capacity at least once monthly before recharging to prevent fuel gauge drift on this Li-ion cell.
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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.

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🔹 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.

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⚠️ 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

14.4V

Amp

3400mAh

JBL PartyBox 100 — 14.4V Li-ion Replacement Battery (SUN-INTE-260)

This 14.4V 3400mAh (48.96Wh) Li-ion battery replaces the original pack in the JBL PartyBox 100 portable speaker. It restores cordless audio playback when the factory battery has degraded or stopped holding charge. Fits the PartyBox 100 and R21-5 using OEM part references SUN-INTE-260 and DH14026CHM.

  • PartyBox 100 and R21-5 compatibility: Both units run the same 14.4V battery rail with the same physical connector and BMS handshake protocol, which is why one cell pack covers both fit models without modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the PartyBox 100 platform. The BMS negotiated correctly with the speaker's protection circuit, holding steady voltage through both high-volume amplifier draw and Bluetooth radio load simultaneously.
  • Monthly discharge cycle for PartyBox 100 users: Let the speaker drain below 20% at least once a month before recharging. Constant top-off charging without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-ion cells — this is especially common with speakers kept plugged in between occasional uses.

Audio distorting before the battery indicator reaches empty on the PartyBox 100

The PartyBox 100 amplifier pulls a hard current spike at high volume. As the battery ages and internal resistance climbs, voltage sags under that load even when the fuel gauge still reads 20–30%. The amplifier hits its minimum rail voltage and clips the audio signal before the protection circuit calls the pack empty. Replacing the battery with a fresh 14.4V cell restores the voltage headroom the amplifier needs to run cleanly at full output.

PartyBox 100 won't wake from USB-C charging after sitting unused for weeks

A deeply discharged Li-ion pack can fall below the USB-C PD minimum acceptance voltage, so the charger handshake never completes and the speaker appears completely dead. The BMS needs a trickle pre-charge to bring the cell back into the PD negotiation window before fast charging kicks in. If the speaker shows no response after 30 minutes on charge, try a different USB-C power adapter rated at least 20W — some lower-wattage adapters lack the pre-charge routine required to recover a deeply discharged pack. If the pack still won't accept charge at all, the cells have likely dropped below the BMS recovery threshold and replacement is the correct fix.

Compatible Models

PartyBox 100 R21-5

Replaces Part Numbers

SUN-INTE-260 DH14026CHM

Technical Specifications

Voltage14.4V
Amp Hours3400mAh
Capacity3400mAh
Rate48.96Wh
Net Weight270.2g /9.53 oz
Gross Weight420.2g /14.82 oz
Approximate Weight420.2g /14.82 oz
Dimension 106.00 x 104.50 x 26.50mm

Product Highlights

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

Frequently Asked Questions

My JBL PartyBox 100 shows a full battery but the audio cuts out or drops quality after about an hour of use — what's causing this?

This is fuel gauge drift, not a sudden cell failure. The speaker's charge indicator loses accuracy when the battery is repeatedly topped off before dropping below 50%, causing the gauge to read full while actual usable capacity is much lower. The BMS shuts down audio output when real cell voltage drops to the cutoff threshold, even though the display hasn't caught up. Run the battery down below 15% before the next full charge to recalibrate the gauge — if the problem continues after two full cycles, the cells have degraded past recovery and need replacing.

The Bluetooth on my PartyBox 100 keeps dropping at high volume but reconnects fine at lower volumes — is this a battery problem?

Yes, this is voltage sag under combined load. At high volume, the amplifier pulls a current spike at the same time the Bluetooth radio draws its own steady current. If the battery's internal resistance has risen — common after a year or two of use — that combined draw causes the voltage rail to sag momentarily, and the Bluetooth module loses enough power to drop its connection. The fix is a fresh battery with lower internal resistance so the voltage rail stays stable under peak amp plus radio draw. Check that your replacement pack sits firmly in its housing, as a loose connection amplifies sag under high-draw conditions.

My PartyBox 100 feels noticeably warm on the side panel during long outdoor sessions — is heat damaging the new battery?

The PartyBox 100 generates heat from two sources simultaneously: the Class D amplifier running at sustained output and the Li-ion cells discharging under load. The fabric and plastic housing traps both. At moderate ambient temperatures this is within normal operating range, but in direct sunlight or enclosed spaces the combined heat accelerates electrolyte degradation in the cells over time. Keep the speaker out of direct sun during extended outdoor use and stand it upright so the vents are unobstructed — this is the single most effective step for preserving cell health in warm-weather conditions.

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