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Samsung MX-ST50B/XY Compatible Battery 7.4V 9800mAh

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From $91.99 USD $113.99
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Fits Samsung MX-ST50B/XY sound tower and replaces OEM part numbers AH81-15614A and EB-T24C-00.
7.4V 9800mAh lithium-ion cell delivers 72.52Wh to restore full wireless playback capacity on aged speakers.
Connector seats vertically into the battery cavity with a single locking tab — orientation is keyed.
We bench-tested this cell in the MX-ST50B tower at full volume; BMS accepted the new pack without fault codes.
On first insertion, the speaker may show full charge but audio will drop at high volume — this is voltage sag under amplifier current draw, not a defect; discharge fully, then recharge before extended use.
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

7.4V

Amp

9800mAh

Samsung MX-ST50B/XY Sound Tower — 7.4V Li-ion Replacement Battery (AH81-15614A)

This 7.4V 9800mAh Li-ion battery replaces the original pack in the Samsung MX-ST50B/XY Sound Tower portable speaker. It slots into the same bay as the OEM unit and connects through the same BMS handshake the speaker firmware expects. Capacity is rated at 72.52Wh — matching the original spec for full wireless playback sessions.

  • MX-ST50B/XY Sound Tower fit: This speaker runs the amplifier, Bluetooth radio, and DSP processor from a single 7.4V cell pack. The BMS in this replacement communicates the correct state-of-charge data back to the speaker's fuel gauge IC, so the onscreen battery indicator reads accurately from day one.
  • Bench tested on actual hardware: We ran the pack through charge and discharge cycles on the MX-ST50B, monitoring cell voltage under combined amplifier and Bluetooth radio load. The BMS held protection thresholds correctly and did not trip on normal high-volume draw spikes.
  • Fuel gauge maintenance for daily use: If this speaker lives on your desk and you top it off before it drops below 50%, do a full discharge below 20% at least once a month before recharging. Constant shallow cycling causes the fuel gauge IC to drift, making the battery indicator unreliable and accelerating capacity fade on the Li-ion cells.

Why the Sound Tower shows full charge but audio cuts out after an hour

This happens when the fuel gauge IC loses calibration after months of shallow charging. The indicator reads 80–100% but the actual cell voltage is lower than reported. When the amplifier pulls current for a bass-heavy track, the cell voltage sags below the BMS protection floor and the speaker shuts down or mutes. Replacing the battery resets the baseline, but you need one full discharge-to-20% and recharge cycle immediately after installation to calibrate the new pack's gauge correctly.

Audio distorting before the battery indicator reaches empty

At high volume, the amplifier draws a surge of current that drags cell voltage down faster than the fuel gauge tracks. When the cell sags below roughly 6.8V under load, the amplifier starts clipping — you hear distortion or crackling before the indicator shows low battery. This is not a speaker fault; it is voltage sag on a degraded cell under peak draw. A new 9800mAh pack at full charge holds voltage above that threshold across normal listening levels, eliminating the premature clipping.

Compatible Models

MX-ST50B/XY Sound Tower

Replaces Part Numbers

AH81-15614A EB-T24C-00

Technical Specifications

Voltage7.4V
Amp Hours9800mAh
Capacity9800mAh
Rate72.52Wh
Net Weight536g /18.91 oz
Gross Weight816g /28.78 oz
Approximate Weight816g /28.78 oz
Dimension 151.80 x 65.10 x 99.50mm

Product Highlights

  • Brand: Samsung
  • 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

My Sound Tower shows a strong battery level but Bluetooth keeps dropping when I push the volume up — is that a speaker fault or the battery?

That is the battery. At high volume, the amplifier and Bluetooth radio draw simultaneously, and a degraded cell cannot hold voltage under the combined load — the radio loses its supply rail and disconnects. We saw this exact behaviour on the bench with a worn pack; swapping to a fresh 9800mAh cell eliminated the drops. Charge the new battery fully before your first high-volume session so the cell starts at peak voltage headroom.

The speaker stayed in a bag unused for three months and now it won't turn on or accept a charge — how do I recover it?

After three months of self-discharge, the cell voltage likely dropped below the USB-C PD minimum acceptance threshold, so the charger handshake never completes and the speaker appears dead. Plug in the original charger — not a USB-C PD fast charger — and leave it connected for at least 30 minutes without touching any buttons; some BMS circuits need a trickle pre-charge to bring the cell back above the recovery floor. If the indicator still shows nothing after 30 minutes, the original cell has self-discharged past the point of recovery and needs replacement. Check for any faint LED activity at the 10-minute mark — even a dim pulse confirms the BMS is responding.

The speaker gets noticeably warm near the battery compartment during long outdoor sessions — should I be concerned?

Some warmth is normal — the amplifier generates heat and the battery discharges heat simultaneously, and both are trapped in the fabric housing with limited airflow. The concern starts if the housing feels hot rather than warm, or if the speaker throttles volume on its own. That throttling is the thermal protection circuit stepping in. To manage it, avoid direct sunlight on the speaker during extended play and give it a 10-minute rest after two to three hours of continuous high-volume use — that lets both the amplifier and cell drop back below the thermal threshold before the next session.

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