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Harman/Kardon JN14BKH00468 Replacement Battery 11.1V 2500mAh

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Fits Harman/Kardon JN14BKH00468, Onyx, and TL150409 portable speakers replacing OEM part PR-633496.
11.1V, 2500mAh lithium-polymer cell delivers 27.75Wh to sustain wireless playback without AC power tethering.
Connector seats flush into the speaker's battery bay with positive terminal forward and locking tab engagement confirmed.
Bench testing showed clean BMS startup on first insertion; voltage ramp tracked expected Li-Po profiles with no early protection cutoff.
On the JN14BKH00468, discharge the pack below 20% capacity once monthly during normal use — constant top-off charging without full discharge causes fuel gauge drift and accelerates capacity fade on the cell.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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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

11.1V

Amp

2500mAh

Harman/Kardon Onyx / JN14BKH00468 — 11.1V Li-Polymer Replacement Battery (PR-633496)

This is an 11.1V, 2500mAh (27.75Wh) Li-Polymer replacement battery for the Harman/Kardon JN14BKH00468, Onyx, and TL150409 portable speakers. It restores wireless playback on units where the original cell has degraded or failed entirely. Voltage and capacity match the original pack specification.

  • Onyx series compatibility: The JN14BKH00468, Onyx, and TL150409 share the same 11.1V three-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol — all three accept this pack without modification.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on the Onyx platform. The BMS accepted the cell, balanced across all three groups, and held the protection thresholds at the expected cutoff points under both idle and active audio load.
  • Monthly discharge cycle for Onyx users: The Onyx is frequently left on a desk or shelf topped off continuously. Run the speaker down below 20% at least once a month before recharging — constant shallow top-off without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-Polymer cell.

Audio distorting before the battery indicator reaches empty

As cell voltage sags under combined amplifier and radio draw, the amp hits its minimum supply rail before the battery gauge reads zero. The result is audible clipping or distortion at moderate-to-high volume even though the display still shows charge remaining. A degraded or partially charged cell has higher internal resistance, which makes the voltage drop sharper under load. If the distortion clears when you lower volume or plug in AC power, the cell — not the amplifier — is the cause.

Speaker won't wake from USB-C after sitting unused for weeks

Li-Polymer cells left uncharged for extended periods can self-discharge below the USB-C PD minimum acceptance voltage, typically around 2.5V per cell. At that point the BMS blocks incoming charge as a protection measure and the speaker shows no response on the USB-C port. Apply a 5V supply via the DC barrel input if the unit has one, or use a Li-Po trickle charger directly on the pack at 0.1C until cell voltage recovers above 3.0V per cell — then connect USB-C to resume normal charging.

Compatible Models

JN14BKH00468 Onyx TL150409

Replaces Part Numbers

PR-633496

Technical Specifications

Voltage11.1V
Amp Hours2500mAh
Capacity2500mAh
Rate27.75Wh
Net Weight132.2g /4.66 oz
Gross Weight202.2g /7.13 oz
Approximate Weight202.2g /7.13 oz
Dimension 99.24 x 33.95 x 19.50mm

Product Highlights

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

Frequently Asked Questions

My Onyx speaker reads full charge but the audio cuts out or gets quiet after extended play — what's happening?

The original Li-Polymer cell loses capacity as it ages, so the fuel gauge drifts and reports a higher state of charge than the cell can actually deliver. Under combined amplifier and Bluetooth radio draw, the cell voltage sags faster than the indicator tracks. The BMS then hits its low-voltage cutoff while the display still shows partial charge. Replacing the cell resets the actual capacity the BMS is working with, and the gauge will read accurately again once the new pack completes a full charge and discharge cycle.

Bluetooth keeps dropping specifically at high volume — the signal is fine at low volume. Is this a radio fault?

It's almost always a power issue, not a radio fault. At high volume, the amplifier draws a current spike that combines with the Bluetooth radio's draw — the combined load causes the battery voltage to sag below the radio module's minimum operating threshold, and the Bluetooth stack drops the connection. Lower the volume and the amplifier current drops, sag disappears, and Bluetooth holds. If the original cell is degraded, its higher internal resistance makes the sag worse under exactly this kind of peak load. A fresh cell with lower internal resistance reduces the sag and keeps the radio stable.

The speaker feels noticeably warm on the fabric housing during long play sessions — is that a battery problem or an amplifier problem?

Both sources contribute, but a degraded Li-Polymer cell adds heat that a healthy cell does not. As internal resistance increases with cell age, more energy is lost as heat during discharge rather than being converted to audio output. The amplifier runs warm regardless — that's normal — but if the warmth is concentrated near the battery cavity or the unit is warmer than it used to be at the same volume level, the cell resistance is the likely cause. Swap the battery pack and monitor; amplifier-sourced heat stays constant, battery-sourced heat drops with a fresh low-resistance cell.

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