Sony SRS-XB501 Replacement Battery 7.4V 6700mAh Li-ion
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Sony SRS-XB501 Replacement Battery 7.4V 6700mAh Li-ion - 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
⚠️ 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.
Sony SRS-XB501 Replacement Battery 7.4V 6700mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Voltage
7.4V
Amp
6700mAh
Sony SRS-XB501 Series — 7.4V Li-ion Replacement Battery (ID659B)
This is a 7.4V, 6700mAh Li-ion replacement battery for the Sony SRS-XB501 and SRS-XB501G portable Bluetooth speakers. It replaces OEM part ID659B. When the original cell degrades and the speaker stops holding a wireless charge, this restores untethered playback.
- SRS-XB501 and SRS-XB501G compatibility: Both models run on the same 7.4V battery rail, share the same connector pinout, and use the same BMS handshake protocol — a single cell covers both variants without any modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SRS-XB501 chassis. The BMS accepted the pack cleanly, balanced the cells without error flags, and the fuel gauge calibrated correctly within the first full cycle.
- Monthly discharge cycle for the SRS-XB501: Speakers left on a desk and topped off daily never hit a meaningful discharge depth. Let the SRS-XB501 drain below 20% at least once a month before recharging — constant shallow cycling causes fuel gauge drift and accelerates cell capacity fade over time.
Why the SRS-XB501 runs warm inside its fabric housing during long sessions
The SRS-XB501 wraps the amplifier board and battery pack tightly inside a fabric and rubber housing with limited airflow. At high volume, the Class D amplifier generates heat, and the Li-ion cell adds its own discharge heat alongside it. Both heat sources share the same enclosed cavity. If the housing feels uncomfortably warm after extended play, drop the volume by 20–30% — this reduces amplifier draw and lowers combined thermal load on the pack.
Audio distorting before the battery indicator reaches empty
This happens when cell voltage sags under combined amplifier and Bluetooth radio draw before the fuel gauge registers low battery. The amplifier clips because the supply voltage has dropped below what it needs to swing full output — even though the indicator still shows charge remaining. It is a voltage sag symptom, not a speaker fault. Recharge the pack when distortion starts; the cell is running below 6.8V under load at that point.
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-XB501 shows a full charge but the audio cuts out after about an hour of playback — is that the battery?
Yes. This is fuel gauge drift caused by prolonged shallow cycling — the battery was never fully discharged, so the gauge lost calibration and reads full when the actual capacity is much lower. Run the speaker down below 20% before recharging and complete two full charge-discharge cycles to let the BMS recalibrate the gauge. After that, the reported charge level should track actual remaining capacity accurately again.
Bluetooth keeps dropping specifically when the volume is loud — it holds fine at low volume on a new battery, why?
At high volume, the amplifier pulls a sharp current spike that combines with the Bluetooth radio draw. If the cell voltage sags too far under that combined load, the radio subsystem drops its connection to stay within operating voltage. This is a cell-impedance issue — a degraded or new-but-cold cell sags more under high current. Let the battery reach room temperature before a high-volume session, and check that the cell voltage recovers above 7.2V at rest between songs.
The SRS-XB501 won't respond when I plug in USB to charge after leaving it unused for two months — nothing happens at all.
A deeply discharged Li-ion pack can fall below the minimum voltage USB-C PD requires before it will accept a charge handshake — typically below 5.5V per cell. The speaker appears completely dead because the charger and BMS cannot negotiate. Use a Li-ion recovery charger set to 7.4V at 0.1A trickle to bring the cell back above 6.0V, then plug into the original USB-C charger. If the pack does not respond above 6.0V after 30 minutes of trickle, the cell has over-discharged past recovery.
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