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Thin rectangular lithium battery pack with smooth finish

Estry

Estry Standard Battery 650mAh 3.7V for MB 660 PXC 550 EPOS ADAPT 660 AHB413645PCT 507271-88

SKU CH-Q35H-WXM65

Replacement lithium battery rated 650mAh 3.7V fits MB 660, PXC 550 and EPOS ADAPT 660 headsets

  • Battery pack size1-pack
  • Battery typeLithium
  • Battery capacity650 mAh
  • Battery voltage rating3.7
  • Product typeBatteries
  • Direct replacement for MB 660 PXC 550 EPOS ADAPT 660 headsets
  • 650 mAh 3.7 V lithium cell matches original capacity
  • 41 Wh energy rating supports extended listening sessions
  • Built-in protection against overcharge over-discharge and short circuit
  • Certified to ISO9001 RoHS CE UN38.3 and MSDS standards

Direct Replacement for EPOS Headsets

This lithium battery pack fits the MB 660 PXC 550 and EPOS ADAPT 660 models using part numbers AHB413645PCT or 507271-88. It arrives as a single 650mAh cell rated at 3.7V and 2.41Wh. The pack restores original run-time without modification.

Certified Safety and Slim Profile

The cell measures 45.44 x 33.84 x 4.3mm and weighs 38.2g, matching the factory footprint for a snug fit inside the headset housing. Protection circuits guard against overcharge, over-discharge, over-voltage and short circuits. Compliance includes ISO9001, RoHS, CE, UN38.3 and MSDS certifications.

Capacity Decides Suitability

At 650mAh the pack delivers the same energy budget the headset was designed around. Buyers who need longer talk time than the original specification provides will not gain extra hours from this unit.

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
Product typeBatteries
Power
Battery typeLithium
Battery capacity650 mAh
Battery voltage rating3.7
In the box
Battery pack size1-pack

Questions about this item

What voltage does this 650 mAh lithium cell deliver?

The cell provides a nominal 3.7 V output, matching the original specification for the compatible headsets.

Will the 45.44 × 33.84 × 4.3 mm pack fit inside my EPOS ADAPT 660?

Yes, those exact dimensions and the 38.2 g weight are designed to match the OEM battery cavity for the listed models.

How do I install the replacement without damaging the connector?

Disconnect the old pack, align the plug polarity, press the connector straight in until it clicks, then secure the pack in the compartment.

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