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Sony SRS-X5 Replacement Battery 7.4V 3400mAh LIS2128HNPD

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Fits Sony SRS-X5 portable speaker; replaces OEM part number LIS2128HNPD.
7.4V, 3400mAh lithium-ion cell delivers full output to the compact Bluetooth speaker amplifier and wireless radio.
Connector slides into the speaker battery slot with a standard retention clip; orientation marked on the pack.
We bench-tested this cell in the SRS-X5 charging circuit; BMS accepted the pack on first insertion with no fault cycling.
On the SRS-X5, discharge the cell below 20% once monthly before recharging — constant top-offs cause fuel gauge drift and accelerate capacity fade.
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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.

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🔹 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

3400mAh

Sony SRS-X5 — 7.4V Li-ion Replacement Battery (LIS2128HNPD)

This is a 7.4V, 3400mAh (25.16Wh) Li-ion replacement battery for the Sony SRS-X5 portable Bluetooth speaker. It fits the SRS-X5 directly, using OEM part number LIS2128HNPD. Replace this cell when the original pack no longer holds a useful charge between listening sessions.

  • SRS-X5 compatibility: The SRS-X5 runs a 7.4V two-cell Li-ion pack with a BMS that monitors cell voltage and temperature. This replacement matches that voltage rail and connector exactly, so the speaker's protection circuit communicates with the pack as it would with the factory cell.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on the SRS-X5 platform and confirmed the BMS accepted the cell without triggering fault states. Charge termination and low-voltage cutoff both fired at expected thresholds.
  • Monthly discharge cycle for the SRS-X5: The SRS-X5 spends most of its life on a desk or shelf, topped off before it drops below 50%. Let the speaker drain below 20% at least once a month before recharging — this corrects fuel gauge drift and slows capacity fade caused by constant shallow cycling on the Li-ion cell.

Audio distortion before the battery indicator reaches empty on the SRS-X5

As the Li-ion cell ages, its internal resistance rises. Under the combined current draw of the amplifier and Bluetooth radio, cell voltage sags below what the amplifier stage needs — even when the fuel gauge still shows charge remaining. The amp clips under that sag, producing audible distortion before the low-battery indicator triggers. Replacing the cell restores the low-resistance discharge curve and removes that voltage floor problem.

Bluetooth dropping out at high volume on the SRS-X5

Pushing the SRS-X5 to high volume spikes the amplifier's current draw sharply. A degraded or deeply cycled battery cannot sustain voltage under that load, and the combined amp-plus-radio draw pulls cell voltage below the BMS trip threshold. The BMS reads this as a low-voltage fault and momentarily cuts output, breaking the Bluetooth connection. Charge the replacement pack fully to 8.4V before first use and confirm the issue clears at full charge before investigating the radio antenna.

Compatible Models

SRS-X5

Replaces Part Numbers

LIS2128HNPD

Technical Specifications

Voltage7.4V
Amp Hours3400mAh
Capacity3400mAh
Rate25.16Wh
Net Weight94g /3.32 oz
Gross Weight234g /8.25 oz
Approximate Weight234g /8.25 oz
Dimension 131.38 x 20.80 x 18.30mm

Product Highlights

  • Brand: Sony
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My SRS-X5 shows a full charge on the indicator but the audio starts cutting out after about an hour of play — is that the battery?

Yes. A degraded Li-ion cell can report near-full charge via the fuel gauge while its actual deliverable capacity has dropped significantly — this is fuel gauge drift caused by years of shallow top-off charging. The speaker's indicator reads cell voltage, not true remaining capacity, so the two numbers stop matching as the cell ages. Replace the pack and run one full discharge-to-below-20% cycle before the next charge to recalibrate the gauge.

The SRS-X5 audio breaks up and sounds distorted when I turn the volume up, but clears at lower levels — what causes that?

High volume forces the amplifier to draw a surge of current, and a worn battery cannot hold its voltage steady under that load. Voltage sags below what the amp stage needs, and it clips — that clipping is the distortion you hear. It is not a speaker driver fault; it is the cell failing to supply stable voltage under peak draw. Fit the replacement pack and retest at full charge before assuming the amplifier board is at fault.

The SRS-X5 won't respond when I plug in USB to charge after it sat unused for several months — is the battery dead?

A Li-ion pack left uncharged for months self-discharges past the BMS minimum acceptance voltage, typically below 2.5V per cell. At that level the BMS blocks the USB charge path entirely as a safety measure, so the speaker appears completely dead and shows no charging indicator. This is a deep-discharge lockout, not a failed port. Replace the pack — a deeply discharged cell that has sat at low voltage for an extended period cannot be safely recovered and should not be force-charged.

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