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Rectangular Ni-MH battery pack with green wrap and wire connector

Estry

Estry 4051 standard battery Ni-MH 3.6V 600mAh 2.16Wh

SKU CH-WDWN-RP5W2 MPN 4051

Ni-MH 3.6V 600mAh replacement pack for Lucent 4051, 7510, 7630, 7650, 7625 and 7640 phones

  • TypeBatteries
  • Battery Pack1-pack
  • Battery TypeNi-MH
  • Battery Capacity600mAh
  • Battery Voltage3.6
  • Direct replacement for Lucent 4051, 7510, 7630, 7625, 7640, 7650 phones
  • 600 mAh Ni-MH cell delivers 2.16 Wh at 3.6 V for reliable talk time
  • Built-in overcharge, over-discharge, over-voltage and short-circuit protection
  • Certified to ISO 9001, RoHS, CE, UN 38.3 and MSDS standards
  • Compact 42.57 × 30.2 × 14.43 mm pack weighs 77.4 g for easy fit

Exact replacement for Lucent phones

This Estry 4051 Ni-MH pack supplies 3.6V and 600mAh for 2.16Wh. It matches the original Lucent 4051 specification and fits the listed SpeakerPhone and desk phone models. The cell is new and certified to ISO9001, RoHS, CE, UN38.3 and MSDS.

Check model and part number first

Verify that your handset or base station appears in the compatibility list: 4051, 7510, 7625, 7630, 7640 or 7650. Confirm the physical pack dimensions of 42.57 x 30.2 x 14.43 mm and weight of 77.4 g match the battery cavity. Ensure the connector and polarity align with the original Lucent pack.

Low self-discharge chemistry runs cool

Ni-MH chemistry generates minimal heat during normal standby and talk cycles. No active cooling is required and audible noise is absent. The integrated protection circuit guards against overcharge, over-discharge, over-voltage and short circuit, keeping power draw stable throughout the charge cycle.

Highlights

  • Direct replacement for Lucent 4051, 7510, 7630, 7625, 7640, 7650 phones
  • 600 mAh Ni-MH cell delivers 2.16 Wh at 3.6 V for reliable talk time
  • Built-in overcharge, over-discharge, over-voltage and short-circuit protection
  • Certified to ISO 9001, RoHS, CE, UN 38.3 and MSDS standards
  • Compact 42.57 × 30.2 × 14.43 mm pack weighs 77.4 g for easy fit

Specifications

BrandLucent
TypeBatteries
Battery Pack1-pack
Battery TypeNi-MH
Battery Capacity600mAh
Battery Voltage3.6

Questions about this item

Does the Estry 4051 Ni-MH pack come with any cables or a charger in the box?

The 4051 pack contains only the 3.6V 600mAh battery itself; no cables or charger are included.

My handset shows part number 7630 — is the 4051 the correct replacement?

Yes, the 4051 replaces Lucent part numbers 4051, 7510, 7625, 7630, 7640 and 7650 used in those speakerphones.

What does the 2.16Wh rating mean for daily talk time on a 7630 speakerphone?

The 2.16Wh capacity typically provides several hours of continuous talk time on compatible Lucent models before recharging.

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