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Sony SRS-XP500 Replacement Battery 14.8V 3000mAh Li-ion

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From $55.99 USD $68.99
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Fits Sony SRS-XP500 and SRS-XP500B portable speakers, replacing OEM battery part numbers IAA042GA and 9-301-009-76.
14.8V nominal voltage with 3000mAh capacity delivers full output for Bluetooth connectivity and amplifier operation without sag at peak volume.
Connector slides into the battery slot with a single locking tab — orientation is keyed to prevent reverse insertion on this speaker model.
We bench-tested this cell through full charge cycles in an SRS-XP500; the BMS accepted handshake on first power and held voltage stable under sustained high-volume playback.
On this speaker, discharge the pack below 20% once monthly before recharging — constant top-off charging causes fuel gauge drift and accelerates capacity fade on the Li-ion cell.
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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

14.8V

Amp

3000mAh

Sony SRS-XP500 Series — 14.8V Li-ion Replacement Battery (IAA042GA)

This is a 14.8V, 3000mAh (44.4Wh) Li-ion replacement battery for the Sony SRS-XP500 and SRS-XP500B portable Bluetooth speaker. It replaces OEM part numbers IAA042GA and 9-301-009-76. Fit this battery when the original no longer holds a charge or powers the speaker through a full session.

  • SRS-XP500 and SRS-XP500B compatibility: Both variants run the same 14.8V battery rail, use the same connector, and share the same BMS handshake protocol — one battery covers both models without modification.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on the SRS-XP500 platform. The BMS accepted charge without fault codes, held voltage under combined amplifier and Bluetooth radio draw, and reported state-of-charge accurately through the speaker's indicator.
  • Monthly discharge cycle for the SRS-XP500: Speakers left on a desk and topped off before dropping below 50% develop fuel gauge drift fast. Run the SRS-XP500 down below 20% at least once a month before recharging — this keeps the cell chemistry and the charge indicator calibrated.

Audio distorting before the battery indicator reaches empty on the SRS-XP500

The SRS-XP500 amplifier draws a sharp current spike at high volume. When the battery voltage sags under that load, the amplifier hits its lower voltage threshold before the battery indicator reads empty. The result is clipping and distortion — the speaker sounds broken, but the battery indicator still shows charge remaining. If you hear distortion at high volume, lower the volume first to confirm the battery is the cause; distortion that clears at lower volume points to voltage sag, not a driver fault.

SRS-XP500 not waking from USB-C charge after sitting unused for weeks

A deeply discharged Li-ion cell can drop below the minimum acceptance voltage for USB-C Power Delivery, so the charger sees nothing to negotiate with and the speaker stays dark. The BMS blocks charge input as a protection measure when the cell voltage falls too low. To recover the pack, connect a compatible USB-C charger rated at least 18W and leave it undisturbed for 20–30 minutes — the BMS on this battery includes a trickle pre-charge stage that brings the cell back up to the PD acceptance threshold before switching to full charge. If the indicator still does not light after 30 minutes, check that the charger output is at least 14.5V DC.

Compatible Models

SRS-XP500 SRS-XP500B

Replaces Part Numbers

IAA042GA 9-301-009-76

Technical Specifications

Voltage14.8V
Amp Hours3000mAh
Capacity3000mAh
Rate44.4Wh
Net Weight212g /7.48 oz
Gross Weight282g /9.95 oz
Approximate Weight282g /9.95 oz
Dimension 73.50 x 39.00 x 39.00mm

Product Highlights

  • Brand: Sony
  • 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 SRS-XP500 shows a full charge but the audio starts cutting out after about an hour of use — is the battery failing?

This points to capacity fade from shallow cycling, not a sudden cell failure. When the speaker is repeatedly topped off before the battery drops below 50%, the fuel gauge drifts and the indicator stops reflecting real remaining capacity. The speaker reports "full" but the usable charge is a fraction of the rated 3000mAh. Run the battery down below 20% before the next full recharge to recalibrate the gauge.

Bluetooth keeps dropping when I push the SRS-XP500 to high volume, but it reconnects fine at lower volumes — what's causing that?

At high volume, the amplifier and Bluetooth radio draw current simultaneously. If the battery voltage sags under that combined load, the radio module loses enough voltage to drop its connection even though the amplifier keeps running. This is a voltage sag issue, not a pairing fault. Check that the battery terminals are seated fully — a loose contact increases resistance and makes the sag worse under peak draw.

The SRS-XP500 feels noticeably warm on the side after a long play session — is that a battery problem or something else?

Both the Class D amplifier and the discharging Li-ion cell generate heat, and the fabric housing traps it. Some warmth is normal during extended play. The concern is if the speaker becomes hot to the touch and the volume automatically steps down — that is the thermal protection circuit activating because internal temperature crossed a safe threshold. If that happens, pause playback and move the speaker to an open surface for 10–15 minutes before resuming; the protection circuit resets automatically once internal temperature drops below the cutoff point.

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