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Rectangular lithium battery pack, black plastic finish, 68.6 by 20.0 by 20.0 millimetres

Estry

Estry SRS-XB21 3000mAh 3.78V standard battery

SKU CH-KFVF-ZDFE9 MPN SRS-XB21

Replacement lithium battery for SRS-XB21 and SRS-XB23 speakers, 3000mAh capacity with overcharge and short-circuit protection

  • Battery pack size1-pack
  • Battery typeLithium
  • Battery capacity3,000 mAh
  • Battery voltage rating3.78
  • Product typeBatteries
  • 3000mAh capacity powers SRS-XB21 and SRS-XB23 speakers longer
  • 78V lithium chemistry matches original voltage for safe operation
  • 34Wh energy rating delivers reliable runtime per charge
  • 6 × 20.0 × 20.0mm form factor fits battery compartment exactly
  • ISO9001, CE, RoHS and UN38.3 certified for quality and safety

Replacement battery for Sony speakers

The Estry SRS-XB21 is a 3000 mAh lithium-ion cell rated at 3.78 V and 11.34 Wh. It matches the original dimensions of 68.6 x 20.0 x 20.0 mm and weighs 76.4 g. The pack includes over-charge, over-discharge, over-voltage and short-circuit protection. Certifications cover ISO 9001, RoHS, CE, UN38.3 and MSDS.

Compatibility and limits

This unit fits the SRS-XB21 and SRS-XB23 speaker models and replaces part numbers ID1056, ST-05 and ST-05S. Buyers with different speaker models or other battery part numbers cannot use this cell. The single-cell pack also does not serve applications that require a multi-cell configuration or a different voltage.

Capacity and voltage spec

The decisive figure is the 3000 mAh capacity at 3.78 V, yielding 11.34 Wh. Match both values to the original battery label before ordering; a different capacity or voltage indicates the wrong part.

How it compares

Measured against everything we stock in Household Batteries & Chargers, at today’s prices. Recalculated every night.

Price $11.99
Pricier than about 55% of the 10,440 comparable items (median $10.99).

Specifications

Product
Product typeBatteries
Power
Battery typeLithium
Battery capacity3,000 mAh
Battery voltage rating3.78
In the box
Battery pack size1-pack

Questions about this item

Will the 68.6 x 20.0 x 20.0 mm battery fit my SRS-XB21 speaker?

Yes, the cell is built to the original dimensions of 68.6 x 20.0 x 20.0 mm and weighs 76.4 g, so it slides into the SRS-XB21 compartment without modification.

How do I install the replacement battery and what step is often missed?

Open the speaker’s battery cover, disconnect the old pack, connect the new 3.78 V 3000 mAh unit observing the correct polarity, then close the cover; the step most people skip is verifying the connector orientation before pressing it in.

When will the 3000 mAh lithium cell need replacing again?

Under normal use the 11.34 Wh pack delivers hundreds of charge cycles; expect to replace it once run-time drops noticeably below the original 3000 mAh capacity.

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