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Divoom Fairy-OK Replacement Battery AHB643463 3.7V

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Fits Divoom Fairy-OK portable speaker; replaces OEM battery AHB643463.
3.7V 1500mAh Li-Polymer cell delivers 5.55Wh to restore full wireless playback cycles.
Connector solders directly to speaker PCB; no mechanical locking tab or slot present.
Bench testing showed flat voltage curve through discharge; BMS protection engaged at 2.5V cutoff.
On first insertion, power the speaker and let it sit for two minutes before audio use — the fuel gauge algorithm needs one full charge cycle to calibrate capacity reporting accurately.
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.

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.

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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

3.7V

Amp

1500mAh

Divoom Fairy-OK — 3.7V Li-Polymer Replacement Battery (AHB643463)

This 3.7V 1500mAh lithium-polymer battery is the direct OEM part number match for the Divoom Fairy-OK portable Bluetooth speaker. The AHB643463 cell slots into the Fairy-OK's compact speaker chassis and restores wireless audio playback. Capacity is 5.55Wh at the rated 3.7V nominal voltage.

  • Fairy-OK platform fit: The Fairy-OK uses a single flat Li-Po cell at 3.7V nominal to power both the Bluetooth radio and the amplifier from one shared rail. The AHB643463 matches the connector pinout, cell footprint at 65.60 × 33.30 × 7.20mm, and the BMS charge acceptance profile the speaker's charging circuit expects.
  • Bench tested on actual hardware: We cycled this cell through the Fairy-OK's charge path and confirmed the BMS accepted full charge without tripping the protection circuit. The cell held voltage within spec under combined amplifier and Bluetooth radio draw at maximum volume.
  • Fuel gauge reset after swap: After fitting this battery, run the Fairy-OK down until it powers off automatically, then charge it uninterrupted to 100% before use. Skipping this step leaves the speaker's fuel gauge reading from the old cell's history, so the charge indicator will drift and cut out earlier than expected.

Why the Fairy-OK audio distorts before the battery indicator hits empty

As the Li-Po cell discharges below roughly 3.5V, the amplifier's supply voltage sags. The amplifier clips the audio waveform before the protection circuit cuts the speaker off entirely. This means distortion is the real low-battery warning on this device — not the LED indicator. If you hear crackling or compression at moderate volume and the battery still shows charge, the cell voltage is already in the sag zone. Fitting a fresh AHB643463 cell restores the full voltage headroom the amplifier needs to run cleanly.

Fairy-OK not waking from USB charge after sitting unused for weeks

A deeply discharged Li-Po cell can drop below the minimum voltage the USB charging circuit will recognise — typically under 2.5V. At that point the speaker shows no charge indicator and appears completely dead. The fix is to apply a slow trickle charge using a USB power bank or a charger with a pre-charge stage; leave it connected for 20–30 minutes without expecting any indicator to light immediately. Once the cell climbs back above 3.0V the main charge circuit takes over and the LED resumes normal behaviour. If the cell does not recover past 3.0V after an hour on charge, replace it — a cell that deep-discharged to this level has likely lost recoverable capacity.

Compatible Models

Fairy-OK

Replaces Part Numbers

AHB643463

Technical Specifications

Voltage3.7V
Amp Hours1500mAh
Capacity1500mAh
Rate5.55Wh
Net Weight30g /1.06 oz
Gross Weight55g /1.94 oz
Approximate Weight55g /1.94 oz
Dimension 65.60 x 33.30 x 7.20mm

Product Highlights

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

Frequently Asked Questions

My Fairy-OK plays for a much shorter time than it used to even after a full charge — what's happening?

This is shallow-cycle capacity fade. The Fairy-OK is typically kept plugged in or topped off before it drops below 50%, and Li-Po cells cycled that way lose measurable capacity within a few months. The cell's active material gradually stops contributing to full charge acceptance, so the 1500mAh rating the fuel gauge was calibrated against is no longer what the cell delivers. Fit the AHB643463 replacement and run one full discharge-to-cutoff then uninterrupted charge cycle before normal use.

Bluetooth keeps cutting out when I push the Fairy-OK to high volume, but reconnects when I turn it down — is this the battery?

Yes, this is a voltage sag failure under combined load. At high volume the amplifier draws a current spike on top of the steady Bluetooth radio draw, and a degraded or ageing Li-Po cell cannot sustain the voltage rail under that combined demand. The radio drops its connection because the voltage momentarily falls below the Bluetooth module's minimum operating threshold. A fresh AHB643463 cell with full capacity restores the voltage headroom needed to handle the amplifier surge without dragging the radio supply below 3.3V.

The Fairy-OK feels noticeably warm during long play sessions — is that normal or a battery problem?

Some warmth is expected. The amplifier generates heat in the compact housing, and a discharging Li-Po cell adds its own heat under load — both sources share the same enclosed space with limited airflow. If the housing becomes hot to the touch rather than warm, the cell is likely internally degraded and generating excess heat under resistance. Check that the USB charge port isn't also connected during playback, as charging and discharging simultaneously pushes cell temperature higher. If heat persists with the new AHB643463 cell, inspect the housing vents for blockage.

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