A secondary cell is a [galvanic cell](/entry/_2azW7zIxVCeNrbXuRrsm2k) that can also be used as an [electrolytic cell](/entry/_2uDtUtOWJCL33X7zTAK8dK); in other words, it can be charged, then used to supply electrical energy to a device, then charged again. Rechargeable batteries are comprised of one or more secondary cells, as opposed to disposable batteries which are comprised of [primary cells](/entry/_7OCTF7b5Z4wM7KvEE16OtK).

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Secondary cell

A galvanic cell, also known as a voltaic cell, is an [electrochemical cell](/entry/_3VVHFqLRvQtI1YzMP7OxVV) that generates electrical energy through chemical reactions, specifically redox reactions. Galvanic cells are the building blocks of [batteries](/entry/_5HYZND6114KVUtCGjFC8mT).

Galvanic cell

An electrolytic cell is a [cell](/entry/_3VVHFqLRvQtI1YzMP7OxVV) containing an electrolyte in which an applied voltage causes a reaction to occur that would not occur otherwise (such as the breakdown of water into hydrogen and oxygen).

Electrolytic cell

The protection circuit (center) of an [18650 cell](/entry/_7RHY0mKlOEp2xsahAaNcbc). The cell on the left includes the protection circuit, while the one on the right has had the circuit removed.

18650 cell protection circuit

A cylindrical [18650 lithium-ion cell](/entry/_7RHY0mKlOEp2xsahAaNcbc) without the casing on, showing the "jelly roll" inside.

18650 cell disassembled

An [18650 cell](/entry/_7RHY0mKlOEp2xsahAaNcbc) and an American quarter for scale.

18650 cell

A lithium-ion cell is a [secondary cell](/entry/_4HwJfgRjCzfOI7z2XTzY0r) ("rechargeable battery") that uses a lithium compound as its cathode (positive terminal) material, and typically graphite as the anode (negative terminal) material. Lithium-ion cells feature high energy density and low self-discharge, making them ideal for a variety devices including mobile phones and electric vehicle batteries.

Lithium-ion cell

This proprietary battery module was developed by Tesla Inc for the original Model S (85kWh editions).
            Sixteen of these modules were assembled together to create the Tesla 85kWh battery in the first generation Model S, which was produced from 2012 until 2016.

Tesla 18650 battery module (5kWh)

Top (positive) and side view of several [18650 cells](/entry/_7RHY0mKlOEp2xsahAaNcbc). The green and yellow cells have the standard length of 65mm, while the pink cells are longer due to the presence of a protection circuit.

18650 cells of different lengths

A primary cell is a [galvanic cell](/entry/_2azW7zIxVCeNrbXuRrsm2k) that is designed to be used only once, such as the cells that comprise disposable batteries.

Primary cell

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Secondary cell

Secondary cell

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