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Small rectangular Ni-MH battery pack with metal contacts

Estry

Estry EL42108 3.6V 300mAh standard battery

SKU CH-BT7X-B3FQS MPN EL42108

A 3.6 V, 300 mAh Ni-MH replacement battery sized 30.0 × 32.0 × 10.5 mm for compatible AT&T cordless phones

  • Specifications3.6
  • Battery Pack1 Year
  • Reliable power for many AT&T cordless models
  • Exact 3.6 V and 300 mAh match original specs
  • Built-in overcharge and short-circuit protection extends life
  • Compact 30.0 x 32.0 x 10.5 mm size fits handset bays
  • Certified to ISO 9001, RoHS, CE and UN 38.3 standards

Direct replacement for cordless handsets

The Estry EL42108 is a 3.6V 300mAh nickel-metal hydride battery built to match the original specifications for a wide range of AT&T cordless phone models. It fits handsets using part numbers such as 2492, 2451, 2434, E5814B, 2404, IA5870, 2422, 2439, 2450, 4200, E1813, T2350, 9162, E5812B, E5828B, 2406, 2437, E5814, 2553, 5890, 2454, 2417, IA5878, 9119, IA5882 and E5812.

Steady output during long calls

The 1.08Wh cell delivers consistent voltage across extended talk time instead of fading after a short burst. Built-in protection guards against overcharge, over-discharge, over-voltage and short circuits, so the pack maintains reliable performance through repeated daily charge cycles. ISO9001, RoHS, CE, UN38.3 and MSDS certifications confirm the safety and quality controls applied during manufacturing.

Upgrade from depleted original packs

This unit replaces a factory battery that no longer holds a charge, restoring full standby and talk duration without changing the handset. The jump is worth it when the original cell shows reduced runtime or fails to power the phone after a normal charge period. Buyers needing a different voltage, a higher capacity or a lithium chemistry will not be served by this Ni-MH pack.

Highlights

  • Reliable power for many AT&T cordless models
  • Exact 3.6 V and 300 mAh match original specs
  • Built-in overcharge and short-circuit protection extends life
  • Compact 30.0 x 32.0 x 10.5 mm size fits handset bays
  • Certified to ISO 9001, RoHS, CE and UN 38.3 standards

Specifications

BrandNi-MH
Model300mAh
Specifications3.6
Battery Pack1 Year

Questions about this item

Does the 3.6V 300mAh Ni-MH cell generate noticeable heat when the handset stays on charge all day?

The 1.08 Wh pack runs cool during normal charging; Ni-MH chemistry at this capacity produces only slight warmth.

Must I already own one of the listed AT&T handset models such as EL42108 or 2492 for this battery to fit?

Yes, it is a direct replacement for models including EL42108, 2492, 2451, 2434 and the other part numbers shown.

Will the 30.0 x 32.0 x 10.5 mm dimensions match the battery compartment in an older AT&T 2404 or 2417 handset I still use?

The pack shares the exact 30.0 x 32.0 x 10.5 mm footprint used by those legacy models, so it seats without modification.

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