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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

  • Battery pack size1-pack
  • Battery typeLithium
  • Battery capacity300 mAh
  • Battery voltage rating3.7
  • Product typeBatteries
  • 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.

How it compares

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

Price $11.99
Pricier than about 55% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameBose
Product typeBatteries
Power
Battery typeLithium
Battery capacity300 mAh
Battery voltage rating3.7
In the box
Battery pack size1-pack

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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