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Rectangular nickel-zinc battery pack, matte finish, 136.40 x 50.70 x 24.60mm

FYIOGXG Replacement Battery for AirSep Freestyle 3, Portable Oxyg, Freestyle 5 3600mAh 14.8V

SKU CH-PBKR-J41VE

Replacement nickel-zinc battery delivers 3600mAh at 14.8V for AirSep Freestyle 3, Portable Oxyg and Freestyle 5 portable oxygen concentrators

  • Battery pack size1
  • Battery typeNickel zinc
  • Battery capacity3,600 mAh
  • Battery voltage rating14.8 V
  • Details1
  • Product typeNickel zinc
  • 3600 mAh capacity powers portable oxygen concentrators longer
  • 8 V nickel-zinc chemistry matches original AirSep specifications
  • 40 x 50.70 x 24.60 mm form factor fits Freestyle 3 and Freestyle 5
  • 0 g weight keeps the device light for mobile use
  • Built-in protection guards against overcharge, over-discharge and short circuits

Replacement Battery for AirSep Freestyle

This nickel-zinc replacement battery fits AirSep Freestyle 3, Freestyle Portable Oxyg and Freestyle 5 portable oxygen concentrators. It delivers 3600mAh capacity at 14.8 volts and matches the original BT015-1 and BT018-1S part numbers. The pack measures 136.40 x 50.70 x 24.60mm and weighs 314.0g.

Ready-to-use pack with protection circuit

The unit ships as a single battery pack with a fully decoded chip that communicates with the concentrator exactly like the original. Built-in safeguards guard against overcharge, over-discharge, over-voltage and short-circuit conditions. Shock-absorbing foam in the package protects the cells during transit.

Straightforward swap with common pitfalls

Installation videos are widely available online and the physical swap is simple, but the connector must be seated firmly or the device will not recognise the pack. A new battery reaches full runtime after two or three complete charge and discharge cycles. Using a low-quality third-party charger can reduce overall service life.

How it compares

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

Price $52.99
Pricier than about 90% of the 10,440 comparable items (median $10.99).

Specifications

Product
Brand nameFYIOGXG
Model nameReplacement battery
Product typeNickel zinc
Power
Battery typeNickel zinc
Battery capacity3,600 mAh
Battery voltage rating14.8 V
In the box
Battery pack size1

Questions about this item

How often will the nickel-zinc battery need to be replaced with daily charging?

A new nickel-zinc battery reaches peak performance after 2 or 3 full charge cycles and should be replaced when run-time drops below your clinical needs.

What limits continuous operation of the 3600 mAh pack on a Freestyle 5?

The 53.28 Wh capacity sets the run-time ceiling; the pack stops delivering power when the built-in protection triggers on over-discharge or over-voltage.

How much heat does the 14.8 V battery generate during all-day indoor use?

Normal operation stays well below the 60 °C storage limit; the nickel-zinc chemistry and protection circuit keep temperature rise modest during continuous discharge.

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