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ICR22650 Harman/Kardon Onyx Studio 4 Replacement Battery 3.7V 3000mAh

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From $30.99 USD $38.99
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Fits Harman/Kardon Onyx Studio 4 and Onyx 4 speakers; replaces OEM part ICR22650.
3.7V, 3000mAh Li-ion cell delivers full wireless playback and hands-free call performance.
Cylindrical 22650 cell slides into the battery chamber with spring-contact alignment; no locking tab.
We bench-tested this cell in the Onyx 4 dock — BMS accepted the new pack on first insertion with no fault codes.
Discharge this speaker to below 20% capacity at least once monthly before recharging to prevent fuel 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.

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

Voltage

3.7V

Amp

3000mAh

Harman/Kardon Onyx Studio 4 — 3.7V Li-ion Replacement Battery (ICR22650)

This is a 3.7V, 3000mAh Li-ion cell for the Harman/Kardon Onyx Studio 4 portable Bluetooth speaker. It replaces the original ICR22650 format cell when the pack no longer holds a useful charge or fails to power the speaker at all. Fits both the Onyx Studio 4 and Onyx 4 variants.

  • Onyx Studio 4 and Onyx 4 compatibility: Both models use the same ICR22650 cylindrical cell, share the same 3.7V nominal voltage rail, and draw from the same connector layout on the charging board — one cell fits both without modification.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the Onyx Studio 4 platform. The BMS accepted the cell without error, balanced correctly at 4.2V full charge, and held the protection cutoff at the expected low-voltage threshold under amplifier load.
  • Monthly discharge cycle for the Onyx 4: This speaker gets topped off constantly on desks and shelves. Let the battery drop below 20% at least once a month before recharging — skipping full discharge cycles causes fuel gauge drift and speeds up capacity fade on the ICR22650 cell.

Audio distorting before the battery indicator reaches empty

As the ICR22650 cell ages, its internal resistance rises. Under high amplifier load, the cell voltage sags below what the amp needs even though the fuel gauge still reads 20–30%. The amplifier clips because it cannot draw enough clean current, and distortion appears well before the low-battery warning fires. Replacing the cell restores the voltage floor and eliminates the sag that causes early clipping.

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

A deeply discharged ICR22650 cell can drop below the minimum acceptance voltage for USB-C PD negotiation — typically under 2.5V. At that level, the charger handshake fails and the speaker appears completely dead rather than charging. To recover, connect to a 5V USB-A charger instead of USB-C, which bypasses PD negotiation and trickle-charges the cell back above the 2.7V reinitialisation threshold before switching to normal charge rate.

Compatible Models

Onyx studio 4 Onyx 4

Replaces Part Numbers

ICR22650

Technical Specifications

Voltage3.7V
Amp Hours3000mAh
Capacity3000mAh
Rate11.1Wh
Net Weight70.8g /2.50 oz
Gross Weight95.8g /3.38 oz
Approximate Weight95.8g /3.38 oz
Dimension 68.30 x 23.60 x 23.60mm

Product Highlights

  • Brand: Harman/Kardon
  • 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

Why does my Onyx Studio 4 Bluetooth keep cutting out when I turn the volume up high, even on a fresh charge?

High volume drives the amplifier to pull a sharp current spike, and when the battery cell has aged internal resistance, that spike causes a brief voltage sag across the 3.7V rail. The Bluetooth radio shares that rail, and the sag is enough to interrupt the wireless link mid-track. A new ICR22650 cell with lower internal resistance holds the voltage steady under combined amp and radio draw — swap the cell and test at full volume before assuming it's a software or pairing issue.

My Onyx Studio 4 shows a full charge but audio drops out completely after about an hour of play — what's happening?

This is fuel gauge drift, not a charging fault. When the ICR22650 is shallow-cycled constantly — plugged in before it drops below 50% — the battery management circuit loses track of true capacity, and the "full" reading no longer reflects actual energy in the cell. The speaker hits real empty while the indicator still looks healthy. Run a full discharge below 20% followed by a full charge to 4.2V to recalibrate the gauge; if the problem persists, the cell has lost capacity and needs replacement.

The Onyx Studio 4 feels noticeably warm through the fabric after a long listening session — is that a battery problem?

Some warmth is expected because the amplifier and the discharging Li-ion cell both generate heat inside a sealed fabric enclosure with limited airflow. It becomes a problem if the speaker is also lying flat on a soft surface like a bed or couch, which blocks the passive venting slots and traps amplifier heat against the cell. Stand the speaker upright on a hard surface during extended play — if it still runs hot enough to trigger thermal protection shutdowns, check that the replacement cell matches the ICR22650 spec exactly, as an undersized cell runs hotter under the same load.

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