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2. Portable oxygen concentrator - Wikipedia

   en.wikipedia.org/wiki/Portable_oxygen_concentrator

   A lightweight portable oxygen concentrator: Inogen One G3 (2,2 kg) Sequal Equinox, transportable concentrator with a high oxygen flow rate A portable oxygen concentrator (POC) is a device used to provide oxygen therapy to people that require greater oxygen concentrations than the levels of ambient air.

3. Oxygen ion battery - Wikipedia

   en.wikipedia.org/wiki/Oxygen_ion_battery

   The ceramic materials do not require toxic metals like those that are common in lithium-ion batteries. [citation needed] The batteries are suitable for grid storage of power collected from sources such as wind and solar. Oxygen lost to side reactions can be replaced by ambient oxygen. [citation needed] Oi batteries feature lower energy density ...

4. Amazon's rechargeable batteries 'last just as long as ... - AOL

   www.aol.com/lifestyle/recharge-amazon-basic...

   For instance, this 12-pack of rechargeable batteries is just $10, with a unit price of $0.86 per battery. A 12-pack from Energizer is almost double the price at $17. A 12-pack from Energizer is ...

5. Oxygen concentrator - Wikipedia

   en.wikipedia.org/wiki/Oxygen_concentrator

   An oxygen concentrator takes in air and removes nitrogen from it, leaving an oxygen-enriched gas for use by people requiring medical oxygen due to low oxygen levels in their blood. [4] Oxygen concentrators provide an economical source of oxygen in industrial processes, where they are also known as oxygen gas generators or oxygen generation plants.

6. Battery pack - Wikipedia

   en.wikipedia.org/wiki/Battery_pack

   Battery cases are small power banks attached to the rear side of a mobile phone like a case. Power may be delivered through the USB charging ports, [18] or wirelessly. [19] Battery cases also exist in the form of a camera grip accessory, as was for the Nokia Lumia 1020. [20] For mobile phones with removable rear cover, extended batteries exist ...

7. Zinc–air battery - Wikipedia

   en.wikipedia.org/wiki/Zinc–air_battery

   The resulting primary zinc–air battery showed peak power density of ~265 mW/cm 3, current density of ~200 mA/cm 3 at 1 V and energy density >700 Wh/kg. [ 19 ] [ 20 ] Rechargeable Zn–air batteries in a tri-electrode configuration exhibited an unprecedented small charge–discharge voltage polarization of ~0.70 V at 20 mA/cm 3 , high ...