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Small rectangular lithium battery pack with smooth finish

Estry

Estry NW-A27 550mAh 3.7V standard battery

SKU CH-3GM9-WB6RB MPN NW-A27

Replacement lithium battery rated 550 mAh at 3.7 V for compatible Sony audio models

  • TypeBatteries
  • Battery Pack1-pack
  • Battery TypeLithium
  • Battery Capacity550mAh
  • Battery Voltage3.7
  • Exact-spec replacement restores original runtime
  • 550 mAh lithium cell matches factory capacity
  • Built-in protection guards against overcharge and short circuits
  • Certified to ISO9001, RoHS, CE, UN38.3 and MSDS
  • Slim 52.35 × 34.1 × 3.2 mm design fits listed Sony models

Direct replacement for Sony audio players

The Estry NW-A27 is a 550mAh 3.7V lithium battery built to match the original specifications for a wide range of Sony Walkman and headphone models. It fits devices such as the NW-A27, NWZ-E463, NWZ-E464, NWZ-S764, NW-A25, NW-A26, MDR-XB650BT, MDR-XB950B1, MDR-ZX330, MDR-DS6500 and MDR-RF985R.

Protected chemistry for steady daily use

The cell includes overcharge, over-discharge, over-voltage and short-circuit protection circuits that maintain safe operation during extended listening sessions. Rated at 2.04Wh, it delivers consistent voltage output without the sudden drops seen in unprotected packs.

Slim profile with certified safety marks

At 52.35 x 34.1 x 3.2mm and 37.0g, the pack slides into the original battery compartment without modification. It carries ISO9001, RoHS, CE, UN38.3 and MSDS certifications, confirming compliance with international transport and substance restrictions. Buyers needing a different capacity or a multi-pack will need another product.

Highlights

  • Exact-spec replacement restores original runtime
  • 550 mAh lithium cell matches factory capacity
  • Built-in protection guards against overcharge and short circuits
  • Certified to ISO9001, RoHS, CE, UN38.3 and MSDS
  • Slim 52.35 × 34.1 × 3.2 mm design fits listed Sony models

Specifications

TypeBatteries
Battery Pack1-pack
Battery TypeLithium
Battery Capacity550mAh
Battery Voltage3.7

Questions about this item

Does the 550mAh 3.7V lithium cell run hot during all-day use?

The pack includes overcharge, over-discharge, over-voltage and short-circuit protection to keep temperature stable during continuous operation.

Which Sony part number must my device already use for this battery to fit?

It replaces LIS1427HNPCS, 1-756-920-32, LIS1427HEPCC, 1-756-920-31 or 1-756-920-21.

Will the 52.35 x 34.1 x 3.2 mm dimensions match the compartment in my NWZ-E463?

Yes, the pack is built to the exact specifications of the original battery for NWZ-E463 and the other listed models.

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