Sony SRS-XB31 Replacement Battery 7.4V 3000mAh IAJ002NA
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Sony SRS-XB31 Replacement Battery 7.4V 3000mAh IAJ002NA - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Sony SRS-XB31 Replacement Battery 7.4V 3000mAh IAJ002NA - is backordered and will ship as soon as it is back in stock.
Voltage
7.4V
Amp
3000mAh
Sony YY7862E / SRS-XB31 / SRS-XB32 / SRS-XB33 — 7.4V Li-ion Replacement Battery (IAJ002NA)
This is a 7.4V 3000mAh Li-ion replacement battery for the Sony YY7862E and SRS-XB31/32/33 portable Bluetooth speakers. It matches the original cell chemistry and connector config. Capacity figures are from the product spec sheet — 3000mAh / 22.2Wh.
- SRS-XB31/32/33 platform compatibility: These three speaker generations share the same battery bay dimensions, connector pinout, and BMS handshake protocol. Swapping between them requires no modification — the voltage rail and cell configuration are identical across the series.
- Bench tested on actual hardware: We ran this pack on the SRS-XB33 under combined Bluetooth radio and amplifier draw at mid-to-high volume. The BMS held steady through repeated amp current spikes without tripping into protection mode. Voltage stayed within spec across the discharge curve.
- Fuel gauge calibration on these speakers: Let the speaker discharge below 20% at least once a month before recharging. Constant top-off charging — plugging in before the battery drops below half — causes fuel gauge drift on the Li-ion cell and accelerates capacity fade over time.
Bluetooth dropping at high volume on the SRS-XB31/32/33
High-volume playback on the XB series pulls current from both the amplifier and the Bluetooth radio simultaneously. On a degraded or deeply discharged cell, this combined draw causes a voltage sag that trips the BMS momentarily — cutting the radio connection before audio resumes. The speaker may appear to reconnect immediately, making the fault look like a wireless issue rather than a power issue. If Bluetooth drops only at high volume and the battery indicator is below 40%, the cell is the cause.
Audio distorting before the battery indicator reaches empty
When the cell voltage sags under amplifier load, the amp clips before the battery indicator shows low. The speaker's fuel gauge reads remaining charge based on resting voltage, not load voltage — so a fatigued cell can show 30% remaining while the amplifier is already starved of headroom. The result is audible distortion, particularly on bass-heavy tracks, well before the low-battery warning triggers. Charge the speaker to 100% and check whether distortion disappears — if it does, the cell is the fault.
Compatible Models
Replaces Part Numbers
Technical Specifications
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-XB33 shows a full charge on the indicator but audio starts cutting out after about an hour of play — why?
This is fuel gauge drift caused by shallow-cycle charging — the battery indicator loses calibration when the speaker is topped off before it drops below 50%. The cell's actual capacity is lower than the gauge reports. To recalibrate, let the speaker run down below 15% before recharging, and repeat this two or three full cycles. After that, the indicator and actual capacity should align again.
The speaker distorts badly on bass-heavy tracks but the battery still shows around 30% — is something wrong with the driver?
The driver is not the problem. At 30% on a degraded cell, resting voltage still looks acceptable to the fuel gauge, but load voltage sags under the amplifier's current draw — especially on low-frequency transients that spike amp demand. That voltage sag starves the amplifier and causes clipping before the low-battery warning fires. Charge to 100% and test again — if the distortion clears, the cell is the fault, not the speaker hardware.
My SRS-XB32 won't wake up from USB-C charging after the battery fully drained — the charging light doesn't come on at all.
When a Li-ion cell discharges below approximately 2.5V per cell, the BMS locks out normal charging to protect the cell from unsafe recovery current. The USB-C PD negotiation on the SRS-XB32 won't initialise until the pack is above the minimum acceptance threshold. Leave the speaker connected to a wall adapter — not a laptop USB port — for 30 to 60 minutes without expecting any indicator light. The BMS trickle-charges the cell back up to a safe voltage before switching to normal charge mode.
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