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Small rectangular lithium battery pack, dark finish, labelled 3.7V 400mAh

Estry

Estry QC35 419811 AHB110520CPS replacement battery

SKU CH-PJJV-ZJ09P

Lithium replacement cell for Bose QuietComfort 35 headphones, 3.7 V and 300 mAh capacity

  • TypeBatteries
  • Battery Pack1-pack
  • Battery TypeLithium
  • Battery Capacity300mAh
  • Battery Voltage3.7
  • Direct replacement for Bose QC35 headphones
  • 7 V lithium cell matches original voltage
  • 300 mAh capacity powers long listening sessions
  • Overcharge and short-circuit protection built in
  • Certified to ISO 9001, RoHS, CE and UN 38.3

Exact replacement for Bose QC35 headphones

This Estry battery replaces the original AHB110520CPS cell used in Bose Quietcomfort 35 and QC35 models carrying part number 419811. It is a single lithium pack rated at 3.7V with a nominal capacity of 300mAh, matching the factory specification for direct swap-in.

Suits owners restoring original runtime on QC35

Buyers who need a drop-in cell for the listed Bose models will find the voltage and connector layout identical to the OEM unit. Users whose headphones use a different part number or who require a higher capacity than 400mAh should look elsewhere.

Simple two-wire solder or connector swap.

Installation requires opening the earcup and either soldering the leads or mating the existing plug, taking care to match positive and negative terminals. The most common issue is reversing the wires, which triggers the protection circuit and prevents charging until corrected.

Highlights

  • Direct replacement for Bose QC35 headphones
  • 7 V lithium cell matches original voltage
  • 300 mAh capacity powers long listening sessions
  • Overcharge and short-circuit protection built in
  • Certified to ISO 9001, RoHS, CE and UN 38.3

Specifications

BrandBose
TypeBatteries
Battery Pack1-pack
Battery TypeLithium
Battery Capacity300mAh
Battery Voltage3.7

Questions about this item

Which headphone model must I already own for this Estry QC35 419811 AHB110520CPS replacement battery to fit?

It fits Bose Quietcomfort 35 and QC35 headphones that use the original AHB110520CPS pack.

Will the 3.7 V 400 mAh cell work with the charging circuit already inside my QC35 headphones?

Yes, the voltage matches the original 3.7 V spec so the existing charger manages it normally.

How can I verify the new pack is working correctly after I install it?

The headphones should power on, show a normal charge indicator and deliver the usual listening time.

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