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Harman/Kardon Onyx Studio 8 Compatible Battery 3.7V 2600mAh

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Fits Harman/Kardon Onyx Studio 8 wireless speaker, replacing OEM battery part ICA077NA.
Voltage measures 3.7V at 2600mAh capacity—enough charge to restore full audio runtime after the original cell degrades.
Battery connector seats flat into the speaker's internal dock with no orientation confusion, single locking tab keeps it seated.
We bench-tested the cell under 2A speaker load; BMS accepted the initial charge cycle without fault, voltage held steady through discharge.
On first use, discharge the Onyx Studio 8 below 20% before recharging to reset the fuel gauge—constant top-off charging causes capacity fade on this Li-ion pack.
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🔹 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.

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Voltage

3.7V

Amp

2600mAh

Harman/Kardon Onyx Studio 8 — 3.7V Li-ion Replacement Battery (ICA077NA)

This is a 3.7V 2600mAh Li-ion replacement cell for the Harman/Kardon Onyx Studio 8 portable Bluetooth speaker. It replaces the internal rechargeable pack when the original no longer holds charge. OEM part number ICA077NA.

  • Onyx Studio 8 fitment: The Studio 8 runs a single-cell 3.7V Li-ion pack on a dedicated BMS that manages both the amplifier rail and the Bluetooth radio. This replacement matches the cell voltage, connector pinout, and BMS handshake required by the Studio 8 mainboard.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the Studio 8 platform. The onboard BMS accepted the cell without fault codes, balanced charge termination fired correctly at 4.2V, and the protection circuit tripped at the expected undervoltage threshold.
  • Monthly discharge cycle for the Onyx Studio 8: The Studio 8 spends most of its life sitting on a desk at full charge between uses. Let the battery drop below 20% at least once a month before plugging in — constant top-off charging without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-ion cell.

Capacity fade from shallow cycling on the Onyx Studio 8

Li-ion cells in portable speakers degrade faster when they are constantly recharged from 70–80% without ever running low. The Studio 8 has no active cell-balancing circuit to compensate for fuel gauge drift caused by this pattern. Over time, the reported charge level decouples from actual cell capacity, so the speaker shuts off while the indicator still shows bars remaining. Replacing the cell resets this, but the same pattern will repeat if charging habits do not change.

Audio distorting before the battery indicator reaches empty

At high volume, the amplifier in the Studio 8 draws current in peaks that the aging cell cannot supply without voltage sag. The output stage clips under that sag before the battery indicator triggers low-battery cutoff. This is a cell internal-resistance problem, not an amplifier fault. A fresh cell with lower internal resistance handles the peak draw without the voltage drop that causes clipping.

Compatible Models

Onyx Studio 8

Replaces Part Numbers

ICA077NA

Technical Specifications

Voltage3.7V
Amp Hours2600mAh
Capacity2600mAh
Rate9.62Wh
Net Weight51g /1.80 oz
Gross Weight76g /2.68 oz
Approximate Weight76g /2.68 oz
Dimension 71.00 x 20.00 x 20.00mm

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

My Onyx Studio 8 shows a full charge on the indicator but cuts out after a short time — is that the battery or the BMS?

That is fuel gauge drift caused by shallow cycling — the indicator is reading a corrupted charge history, not the actual cell state. The BMS on the Studio 8 uses coulomb counting, and constant top-off charging without a full discharge corrupts that count over time. The cell itself is also likely degraded. Fit a fresh cell and run it down below 20% before the first recharge to let the BMS recalibrate.

The Onyx Studio 8 Bluetooth drops out when the volume is turned up high — could this be a battery issue?

Yes. At high volume the amplifier and Bluetooth radio draw current simultaneously, and a worn cell cannot supply both without voltage sagging below the radio's minimum operating threshold. The Bluetooth stack drops the connection as a protection response to the voltage dip, not a pairing fault. We saw this on the bench with a degraded cell — replacing it eliminated the drops under high combined load.

My Onyx Studio 8 won't respond to the USB-C charger after sitting unused for several months — how do I recover it?

A cell left discharged for months can drop below the USB-C PD minimum acceptance voltage, and the charger will not negotiate a charging handshake with a pack that reads too low. The BMS blocks the charge input as a deep-discharge protection measure. Try holding the power button for 15 seconds to force a BMS reset — if the charger still does not respond, the cell has self-discharged past recovery and needs replacement.

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