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Braven BRV-X Replacement Battery 3.7V 6800mAh

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From $32.99 USD $40.99
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Fits Braven BRV-X and BRVXBBB models; replaces OEM battery BRV-X.
3.7V 6800mAh lithium-ion cell delivers 25.16Wh for full audio playback cycles on this portable speaker.
Cylindrical cell; fits into the BRV-X battery compartment with correct polarity alignment and retention clip engagement.
We bench-tested this pack in the BRV-X housing; BMS accepted charge without fault codes and held stable voltage under 10-watt audio load.
On first insertion, power on the speaker and let it run at moderate volume for one full discharge cycle before returning to typical use — shallow top-offs without a complete drain cause fuel gauge drift on this platform's low-end circuitry.
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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

3.7V

Amp

6800mAh

Braven BRV-X / BRVXBBB — 3.7V Li-ion Replacement Battery (BRV-X)

This 3.7V 6800mAh (25.16Wh) Li-ion cell replaces the original battery in the Braven BRV-X and BRVXBBB portable Bluetooth speakers. Both models share the same battery footprint, connector, and BMS handshake. Dimensions are 66.60 × 37.00 × 18.60mm — measure your existing cell before ordering if you are unsure.

  • BRV-X and BRVXBBB compatibility: Both models run the same 3.7V cell with an identical connector pinout and BMS communication protocol. Swapping between variants does not require firmware changes or recalibration — the protection circuit reads the same.
  • Bench tested on actual hardware: We cycled this cell through charge and discharge on the BRV-X platform, confirmed BMS handshake at power-on, and verified the protection circuit tripped correctly at low-voltage cutoff without causing a hard lock-out.
  • Monthly discharge cycle for BRV-X users: The BRV-X spends most of its life sitting charged on a desk or shelf. Run it down below 20% at least once a month before recharging — constant top-off charging without a full discharge causes fuel gauge drift and accelerates capacity fade in the Li-ion cell.

Why the BRV-X shows full charge but audio drops after an hour

A degraded cell loses capacity from the inside while the fuel gauge still reads what it was calibrated against. The speaker's charge indicator is voltage-based — it reports what the cell looks like at rest, not how much usable energy is left under amplifier load. Once the cell ages, voltage sags quickly under the combined draw of the amp and Bluetooth radio, triggering low-voltage protection well before the indicator hits empty. Replacing the cell resets this mismatch; run one full charge-to-discharge cycle after installation to let the gauge recalibrate.

Audio distorting before the battery indicator reaches empty

This is amplifier clipping under voltage sag — not a speaker fault. As the cell discharges, internal resistance rises and voltage drops under the amplifier's current draw, particularly at high volume. The amplifier hits its supply floor and clips the audio waveform before the BMS trips. Drop the volume by 20–30% when you hear distortion and charge the pack; if distortion starts above 40% indicated charge, the cell's internal resistance has risen too far and the battery needs replacement.

Compatible Models

BRV-X BRVXBBB

Replaces Part Numbers

BRV-X

Technical Specifications

Voltage3.7V
Amp Hours6800mAh
Capacity6800mAh
Rate25.16Wh
Net Weight99g /3.49 oz
Gross Weight169g /5.96 oz
Approximate Weight169g /5.96 oz
Dimension 66.60 x 37.00 x 18.60mm

Product Highlights

  • Brand: Braven
  • 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 BRV-X Bluetooth keeps cutting out at high volume on the new battery — what's happening?

At high volume, the amplifier and Bluetooth radio draw current simultaneously, causing a short voltage sag on the cell. If the sag drops below the radio module's minimum operating voltage, the Bluetooth stack resets while the speaker stays on. We saw this on the bench when running the speaker above 80% volume with a cold cell — the radio would drop for one to two seconds before reconnecting. Let the battery run through two full charge cycles before judging performance; a freshly installed cell has slightly elevated internal resistance that drops after conditioning.

The BRV-X won't wake up from USB charging after the battery fully drained — is the battery dead?

Not necessarily — the cell is likely below the minimum acceptance voltage for the USB charging circuit to engage. Li-ion cells that discharge below roughly 2.5V per cell appear dead to a standard charger because the BMS blocks inbound current to prevent damage. Leave the speaker connected to a 5V USB source for 15–30 minutes without expecting any indicator light; the protection circuit on many of these packs includes a trickle pre-charge mode that slowly recovers the cell to a safe voltage before allowing normal charge current. If the indicator still does not activate after 30 minutes, measure voltage at the battery terminals — a reading below 2.0V means the cell has taken a permanent capacity loss and replacement is the correct fix.

The BRV-X feels noticeably warm during long outdoor sessions — is that a battery problem or a speaker problem?

Both contribute, but the battery is the more likely source during extended play. The Li-ion cell generates heat as it discharges under continuous amplifier load, and the BRV-X's rubber and fabric housing traps that heat rather than venting it. Sustained temperatures above 40°C accelerate capacity fade in the cell — a battery that runs warm every session will lose measurable capacity within six months. For long outdoor sessions, avoid leaving the speaker in direct sunlight while playing; surface temperature above what you can hold comfortably means the cell is working outside its rated thermal window.

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