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Sony SRS-XG300 Replacement Battery 7.4V 5200mAh 903867-2S2P

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Fits Sony SRS-XG300 portable speaker; replaces OEM part 903867-2S2P.
7.4V, 5200mAh lithium-ion cell delivers full power output for waterproof Bluetooth operation.
Connector seats flush into Sony's battery cavity with keyed plastic locking tab oriented vertically.
Bench testing showed BMS balance circuit activating within first two charge cycles as expected.
On first insertion, the SRS-XG300 may require a full power cycle to recognize the new cell and sync fuel gauge calibration.
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

5200mAh

Sony SRS-XG300 — 7.4V Li-ion Replacement Battery (903867-2S2P)

This is a 7.4V, 5200mAh (38.48Wh) Li-ion replacement battery for the Sony SRS-XG300 portable Bluetooth speaker. It uses OEM part number 903867-2S2P and slots directly into the speaker's internal battery bay. When the original cell loses capacity after repeated charge cycles, this unit restores full wireless audio playback capability.

  • SRS-XG300 fitment: The XG300 runs a dual-cell 2S2P Li-ion configuration at 7.4V nominal. This pack matches that voltage rail, connector pinout, and BMS communication protocol — the speaker's protection circuit recognises the pack and allows full charge and discharge cycles.
  • Bench tested on actual hardware: We cycled this pack through the XG300's charge circuit and confirmed the BMS handshake, thermal cutoff response, and cell balancing at both high-volume amplifier draw and Bluetooth idle. No false low-battery flags appeared during the discharge run.
  • Discharge cycling for fuel gauge accuracy: If the speaker is kept plugged in or topped off constantly, let the battery discharge below 20% at least once a month before recharging. Without a full discharge cycle, the fuel gauge drifts and the indicator becomes unreliable.

Audio distorting before the battery indicator reaches empty

As the pack discharges toward 6.8V, the amplifier stage in the XG300 begins clipping because it can no longer draw the current needed for high-volume output. This causes audible distortion — crackling or compressed audio — while the battery indicator still shows one or two bars. The BMS has not yet hit its cutoff threshold, but the cell voltage has sagged below the amplifier's stable operating point. If this happens consistently, recalibrate the fuel gauge by running a full discharge to automatic shutoff, then charging uninterrupted to 100%.

Speaker won't wake from USB-C after a deep discharge

If the SRS-XG300 sits unused for several weeks, the cell voltage can drop below the USB-C Power Delivery minimum acceptance threshold — typically under 2.5V per cell. At that point, the speaker will not respond to a USB-C cable at all. Connect the speaker to a USB-C charger rated at 5V/1.5A or higher and leave it connected for at least 20 minutes without pressing any button — the BMS needs time to trickle-charge the cells back above the PD acceptance floor before it will negotiate a full charge session.

Compatible Models

SRS-XG300

Replaces Part Numbers

903867-2S2P

Technical Specifications

Voltage7.4V
Amp Hours5200mAh
Capacity5200mAh
Rate38.48Wh
Net Weight186g /6.56 oz
Gross Weight256g /9.03 oz
Approximate Weight256g /9.03 oz
Dimension 66.00 x 37.60 x 36.70mm

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-XG300 shows a full charge but the audio cuts out after about an hour of use — is that a battery issue?

Yes. This is classic fuel gauge drift caused by shallow cycling — the speaker was repeatedly topped off before the battery dropped below 50%, so the BMS lost track of true capacity. The indicator reads full, but the usable charge is much lower than it should be. Run the speaker down to automatic shutoff, then charge it uninterrupted to 100% to recalibrate the gauge.

Bluetooth keeps dropping when I push the volume past three-quarters on the XG300 — the battery looks fine.

At high volume, the amplifier and Bluetooth radio draw current simultaneously, which causes a combined load spike the degraded cell can't sustain without voltage sag. The radio module drops its connection first because it's more sensitive to the voltage dip than the amp is. This is a cell-condition issue, not a Bluetooth fault. Fitting a fresh 5200mAh pack eliminates the sag and the drops.

The SRS-XG300 feels noticeably warm through the fabric grille during long outdoor sessions — is that normal or a battery warning sign?

Some warmth is expected — the amplifier generates heat, and the battery adds its own discharge heat inside a sealed enclosure. It becomes a concern if the speaker is also in direct sun or charging while playing, because the combined thermal load can push cell temperature above the BMS's comfort range and trigger a protective current limit. Keep the speaker in shade during extended sessions and avoid charging via USB-C while playing at high volume — run it on battery only until the session ends, then charge it at rest.

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