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Small rectangular Ni-MH battery pack, light plastic casing, two metal contacts, 42.57 by 30.2 by 14.43mm

Estry

Estry 638 standard battery Ni-MH 3.6V 600mAh

SKU CH-E3ND-BEVAR MPN 638

Ni-MH 3.6V 600mAh replacement battery compatible with Bell South 638, YCL-7702, HAC891, YCL-7701, 820, 637, 627, 629, 810, TL6155, 636, YCL-7703

  • Battery pack size1-pack
  • Battery typeNi-MH
  • Battery capacity600 mAh
  • Battery voltage rating3.6
  • Product typeBatteries
  • Ni-MH chemistry avoids memory effect for longer usable life
  • 6V 600mAh delivers 2.16Wh to power compatible handsets
  • Fits Bell South 638 YCL-7702 HAC891 YCL-7701 820 637 627 629 810 TL6155 636 YCL-7703
  • Built-in overcharge over-discharge over-voltage and short-circuit protection
  • Certified ISO9001 RoHS CE UN38.3 MSDS for safety compliance

Replacement for Bell South cordless handsets

The Estry 638 is a nickel-metal hydride battery pack rated at 3.6 volts and 600 milliampere-hours. It matches the original specifications for models including 638, YCL-7702, HAC891, YCL-7701, 820, 637, 627, 629, 810, TL6155, 636 and YCL-7703. The pack measures 42.57 by 30.2 by 14.43 millimetres and weighs 77.4 grams. Certifications include ISO9001, RoHS, CE, UN38.3 and MSDS.

Sustained talk time and standby

Ni-MH chemistry delivers a steady voltage curve during long calls and holds charge well during days on the cradle. The 2.16 watt-hour capacity supports typical household usage patterns without sudden voltage sag. Built-in protection guards against overcharge, over-discharge, over-voltage and short circuits, which helps preserve cycle life over repeated daily charging.

Direct drop-in installation

The pack fits the original battery compartment with no soldering or adapter required. Polarity and connector layout follow the factory design, so alignment is straightforward. The most common issue is ordering the wrong variant; confirm the handset model number or original part number before purchase. Buyers needing a different voltage, chemistry or form factor should look elsewhere.

How it compares

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

Price $9.99
Cheaper than about 60% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameBell South
Product typeBatteries
Power
Battery typeNi-MH
Battery capacity600 mAh
Battery voltage rating3.6
In the box
Battery pack size1-pack

Questions about this item

How much heat does the 3.6V 600mAh Ni-MH pack generate during continuous daily use?

Normal operation stays near room temperature; only a faulty charger or short circuit would make it noticeably warm.

What must I already own to charge this 638 replacement pack?

A charger designed for 3.6V Ni-MH cordless-phone batteries with the correct contact layout.

Will this 638 battery work in a handset that originally used the 627 or 629 pack?

Yes — the 638 replaces part numbers 627, 629, 636, 637, 810, 820, YCL-7701, YCL-7702, YCL-7703, HAC891 and TL6155.

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