We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Rectangular nickel-zinc battery pack, dark casing, connector on one end

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

SKU CH-Z7S1-XZQND

A 3600 mAh nickel-zinc replacement battery at 14.8 V for AirSep Freestyle 3 and 5 portable oxygen concentrators

  • Specifications1
  • Typenickel_zinc
  • Battery Pack1
  • Battery Typenickel_zinc
  • Battery Capacity3600 milliamp_hours
  • Battery Voltage14.8 volts
  • 3600 mAh capacity extends portable oxygen use
  • 8 V nickel-zinc chemistry matches original specs
  • 40 × 50.70 × 24.60 mm fits Freestyle 3 and 5
  • 0 g weight keeps device light for travel
  • Fully decoded chip works like the original battery

Direct Replacement for AirSep Units

This nickel-zinc battery replaces the original power packs used in AirSep Freestyle 3, Freestyle 5 and Freestyle Portable Oxygen concentrators. It matches the BT015-1 and BT018-1S part numbers so the device recognises it immediately. The fully decoded chip reports capacity and health data exactly like the factory unit. Users who need a different voltage or chemistry cannot use this pack.

Compact Pack with Integrated Protection

The cell measures 136.40 x 50.70 x 24.60 mm and weighs 314.0 g, fitting the existing battery bay without modification. A built-in circuit guards against overcharge, over-discharge, over-voltage and short circuits during daily charging cycles. The connector aligns with the concentrator’s socket for a secure lock. Installers who cannot access the latch mechanism will find the pack difficult to seat.

Ready-to-Use with Cycle Guidance

The package includes the single battery wrapped in shock-absorbing foam for transit protection. No charger, cables or software are supplied; the unit relies on the concentrator’s own charging system. The maker advises two or three full charge-discharge cycles before relying on run-time figures. Buyers expecting a desktop charger or calibration utility will need to source those separately.

Highlights

  • 3600 mAh capacity extends portable oxygen use
  • 8 V nickel-zinc chemistry matches original specs
  • 40 × 50.70 × 24.60 mm fits Freestyle 3 and 5
  • 0 g weight keeps device light for travel
  • Fully decoded chip works like the original battery

Specifications

BrandFYIOGXG
ModelReplacement battery
Specifications1
Typenickel_zinc
Battery Pack1
Battery Typenickel_zinc
Battery Capacity3600 milliamp_hours
Battery Voltage14.8 volts

Questions about this item

What voltage and capacity does the 14.8 V nickel-zinc pack deliver?

It supplies 14.8 volts and 3600 milliamp-hours, yielding 53.28 watt-hours of energy.

Will the 136.40 × 50.70 × 24.60 mm case fit my Freestyle 3 or 5?

Yes, those dimensions match the original BT015-1 and BT018-1S batteries used in Freestyle 3, Freestyle Portable Oxygen and Freestyle 5 units.

Which step do installers most often miss when fitting the pack?

Fully seating the connector so the decoded chip communicates with the device; a loose plug prevents the battery from being recognised.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.