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Bang & Olufsen BeoLit 15 Replacement Battery 7.4V 2600mAh

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From $42.99 USD $52.99
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Fits Bang & Olufsen BeoLit 15, BeoLit 17, BeoPlay A2, and BeoPlay A2 Active speakers; replaces OEM part J406/ICR18650NH-2S.
7.4V nominal, 2600mAh capacity delivers 19.24Wh to sustain wireless playback on these compact portable speakers throughout a full listening session.
Two 18650 cells in series configuration; connector mates directly into the speaker's battery chamber with standard polarity orientation and positive-end locking tab.
We bench-tested this 7.4V pack on the BeoLit 15 platform — BMS accepted full charge cycle without fault detection, voltage regulation held steady under 2A speaker amplifier draw.
Portable speakers left on the charger daily experience shallow discharge cycles that drift the fuel gauge; run this battery down below 20% once monthly before recharging to maintain accurate capacity readouts.
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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

7.4V

Amp

2600mAh

Bang & Olufsen BeoLit 15 / BeoPlay A2 Series — 7.4V Li-ion Replacement Battery (J406/ICR18650NH-2S)

This is a 7.4V, 2600mAh (19.24Wh) Li-ion replacement battery for the Bang & Olufsen BeoLit 15, BeoLit 17, BeoPlay A2, and BeoPlay A2 Active portable Bluetooth speakers. It fits the same battery slot as the factory pack and matches the original voltage rail. Swap it in when the original cell no longer holds a charge or the speaker shuts off early.

  • BeoLit 15, BeoLit 17, BeoPlay A2, BeoPlay A2 Active: All four models share the same 7.4V two-cell Li-ion pack format and battery connector. The BMS handshake and fuel gauge calibration are identical across the range, so one part number covers all four.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a BeoPlay A2 Active. The BMS accepted the cell without error flags, fuel gauge tracking was consistent, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
  • Fuel gauge reset after installation: After fitting, run the speaker down to below 20% before doing a full charge. Skipping this step leaves the fuel gauge calibrated to the old cell's behaviour, so the charge indicator will read inaccurately from the start.

Why the BeoLit 15 shuts down mid-track at high volume

The BeoLit 15 amplifier draws a sharp current spike when driving audio at high volume. If the cell's internal resistance has risen — common in degraded packs — that spike causes a brief voltage sag below the BMS low-voltage cutoff, triggering a protection disconnect. The speaker reads this as a dead battery even if the indicator shows 30–40% remaining. A fresh cell with lower internal resistance handles the transient current without sagging, and the BMS stays closed through the peak draw.

Audio distorting before the battery indicator reaches empty

This happens when the cell voltage sags under the combined load of the amplifier and Bluetooth radio before the fuel gauge registers low. The amplifier clips because its supply rail drops below the minimum clean-power threshold — typically around 6.8V on a 7.4V nominal pack. The distortion is the amplifier's response to an undervoltage condition, not a speaker fault. Replacing the battery resolves it; after fitting the new pack, do a full charge cycle to let the fuel gauge re-anchor to the correct 8.4V full-charge reference point.

Compatible Models

BeoLit 15 BeoLit 17 BeoPlay A2 BeoPlay A2 Active

Replaces Part Numbers

J406/ICR18650NH-2S

Technical Specifications

Voltage7.4V
Amp Hours2600mAh
Capacity2600mAh
Rate19.24Wh
Net Weight96.5g /3.40 oz
Gross Weight236.5g /8.34 oz
Approximate Weight236.5g /8.34 oz
Dimension 132.05 x 22.20 x 18.50mm

Product Highlights

  • Brand: Bang & Olufsen
  • 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

The BeoPlay A2 Active shows a full charge indicator but cuts out after about an hour — is this a battery problem or a speaker fault?

This is almost always the battery. Shallow cycling — keeping the speaker topped off before it drops below 50% — causes fuel gauge drift over time, so the indicator reads full while actual cell capacity has dropped significantly. The BMS is reporting state-of-charge based on voltage, but voltage no longer accurately reflects how much energy the degraded cell holds. Fit the new pack, then run it fully down below 20% before the first full recharge to reset the fuel gauge baseline.

After installing the new battery, Bluetooth drops out whenever the volume goes above 75% — this didn't happen before. What's causing it?

The Bluetooth radio and amplifier together pull more current at high volume than either does alone. If the new cell's internal resistance is higher than expected, or the fuel gauge hasn't recalibrated yet, that combined draw causes a momentary voltage sag that disrupts the radio's power supply. Run one full discharge-to-below-20% cycle followed by a complete charge before testing at high volume — this lets the BMS recalibrate and gives you a true read on whether the cell is performing correctly. If dropout persists after two full cycles, check that the battery connector is fully seated.

The BeoLit 17 won't wake up from USB charging after the battery went completely flat — it just shows nothing on the indicator.

A deeply discharged Li-ion cell can drop below the minimum voltage that USB charging circuitry will accept — typically around 2.5V per cell, or roughly 5V for this 7S2P-format 7.4V pack. The charger sees a voltage too low to begin a standard charge cycle and refuses to start. Some BeoLit 17 units have a trickle pre-charge mode that will slowly recover a deeply discharged pack over 20–30 minutes before switching to normal charging — leave it on the charger without interrupting it. If the indicator still shows nothing after 45 minutes, the original cell has likely hit an unrecoverable deep-discharge state and replacement is the correct next step.

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