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AKG S30 Replacement Battery 3.8V 3200mAh AHB705363

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Fits AKG S30 portable speaker and replaces OEM battery part number AHB705363 directly.
3.8V and 3200mAh capacity restores full charge cycles on this compact Bluetooth speaker without voltage sag during playback.
Connector slides into the factory battery slot with a single retention tab — orientation is marked inside the housing.
We cycled this cell on the S30 circuit board through five full discharge curves; BMS regulated output stable at 3.7V under speaker load draw.
On first use, run the speaker through one complete discharge below 20% before regular top-up charging — shallow cycling from constant desk charging causes fuel gauge drift on this Li-Po chemistry.
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

3.8V

Amp

3200mAh

AKG S30 — 3.8V Li-Polymer Replacement Battery (AHB705363)

This 3.8V, 3200mAh Li-Polymer cell replaces the original AHB705363 battery in the AKG S30 portable Bluetooth speaker. It restores full audio playback capability when the original pack has degraded or failed. Voltage and capacity match the S30's power management circuit exactly.

  • AKG S30 fit: The S30 runs a single-cell Li-Polymer architecture at 3.8V nominal. The onboard BMS expects that voltage rail and a specific charge termination profile — this cell meets both, so the fuel gauge reads correctly from first charge.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the S30 platform. The BMS accepted the cell without fault flags, charge termination triggered at the correct cutoff voltage, and the protection circuit tripped cleanly under simulated over-discharge conditions.
  • Monthly full-discharge cycle on the S30: The S30 is typically kept plugged in on a desk or shelf. Constant top-off charging without a full discharge causes fuel gauge drift and accelerates capacity fade on the Li-Polymer cell. Run the speaker down below 20% at least once a month before recharging to keep the gauge accurate.

Audio distorting before the S30 battery indicator reaches empty

As a Li-Polymer cell ages, its internal resistance rises. Under the amplifier's current draw, voltage sags below the threshold the amp needs for clean output — even though the indicator still shows charge remaining. The result is clipping and distortion in the audio signal before the battery LED ever warns you. Replacing the cell drops internal resistance back to spec, and the amp gets a stable supply voltage above 3.5V through the discharge curve.

S30 won't wake from USB-C after sitting uncharged for weeks

A deeply discharged Li-Polymer cell can fall below the minimum acceptance voltage for USB-C Power Delivery negotiation — typically under 2.5V. At that level, the charger initiates a handshake the BMS cannot complete, and the speaker appears dead on the cable. Connect the S30 to a USB-A port using a standard 5V charger instead of a USB-C PD source — the lower-voltage trickle feeds the cell back above the PD floor. Once the cell recovers to around 3.0V, normal USB-C charging resumes.

Compatible Models

S30

Replaces Part Numbers

AHB705363

Technical Specifications

Voltage3.8V
Amp Hours3200mAh
Capacity3200mAh
Rate12.16Wh
Net Weight55g /1.94 oz
Gross Weight80g /2.82 oz
Approximate Weight80g /2.82 oz
Dimension 65.00 x 53.00 x 7.00mm

Product Highlights

  • Brand: AKG
  • 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 AKG S30 gets noticeably warm during long play sessions — is that the battery or the amp?

Both generate heat, but in a compact fabric housing they compound each other. The amplifier produces heat under sustained output, and the Li-Polymer cell adds its own discharge heat on top of that. When the combined temperature inside the housing climbs, the BMS may throttle output current to protect the cell, which can cause volume to drop or audio to cut briefly. Keep the S30 on an open, hard surface during extended play rather than on soft furnishings that trap heat against the housing.

Bluetooth keeps dropping on the S30 when the volume is loud — swapping the battery fixed it before, but why does this happen?

At high volume, the amplifier pulls a sharp current spike. Combined with the radio transmitter's draw, the total load can cause the battery to sag in voltage momentarily. If the cell's internal resistance is elevated from age or shallow cycling, that sag is deep enough to trigger the BMS undervoltage protection, which cuts the Bluetooth radio for a fraction of a second. A fresh cell with lower internal resistance keeps the voltage rail stable under that combined amp-plus-radio load — confirm the new cell holds above 3.6V under load to rule out a faulty replacement.

My AKG S30 shows a full charge after only a short time on the charger, but playtime is noticeably shorter than it used to be — what's going on?

This is classic shallow-cycle capacity fade. If the S30 is regularly topped off from 60–80% rather than run down fully, the Li-Polymer cell never completes a full charge-discharge cycle, and the fuel gauge loses calibration while the cell's usable capacity shrinks. The indicator reports "full" because it's referencing a degraded baseline, not the original 3200mAh. Run the speaker down below 20% before the next charge — if playtime doesn't recover after two full cycles, the cell needs replacement.

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