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2. 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 ...

3. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   Some versions have a tap at 22.5 volts. GB Battery: C Battery Eveready 761: 1.5 to 9 V: Threa­ded posts or banana sockets H: 76.2 L: 101.6 W: 31.75 Originally used in vintage vacuum tube equipment for grid bias. Still popular for school science class use as a variable voltage supply as the current version has several taps at 1.5 volt intervals ...

4. 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.

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. Electric battery - Wikipedia

   en.wikipedia.org/wiki/Electric_battery

   From top to bottom: a large 4.5-volt 3R12 battery, a D Cell, a C cell, an AA cell, an AAA cell, an AAAA cell, an A23 battery, a 9-volt PP3 battery, and a pair of button cells (CR2032 and LR44) Batteries are classified into primary and secondary forms: Primary batteries are designed to be used until exhausted of energy then discarded. Their ...

7. Rechargeable battery - Wikipedia

   en.wikipedia.org/wiki/Rechargeable_battery

   A battery bank used for an uninterruptible power supply in a data center A rechargeable lithium polymer mobile phone battery A common consumer battery charger for rechargeable AA and AAA batteries. A rechargeable battery, storage battery, or secondary cell (formally a type of energy accumulator), is a type of electrical battery which can be ...