The **Panasonic NCR18650B** is a [18650 cylindrical lithium-ion](/entry/tc-ec-cell-18650) [cell](/entry/tc-ec-cell-s) sold by Panasonic.

Product

Panasonic NCR18650B

A secondary cell is a [galvanic cell](/entry/tc-ec-cell-g) that can also be used as an [electrolytic cell](/entry/tc-ec-cell-e); 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/tc-ec-cell-p).

Secondary cell

The jelly roll or Swiss roll design is the design used in the majority of cylindrical rechargeable batteries,  including nickel–cadmium (Ni-Cd), nickel-metal hydride (Ni-MH), and lithium-ion (Li-ion).  The design has this name because the cross section of the battery looks like a Swiss roll ^[from Wikipedia, ["Jelly roll"](https://en.wikipedia.org/wiki/Jelly_roll_(battery))].

Jelly roll

An 18650 cell is a standard format [cylindrical lithium-ion](/entry/tc-ec-cell-li-cyl)
[cell](/entry/tc-ec-cell-s), with a diameter of {this.get(prop=prop("diameter"))}
and a length of {this.get(prop=prop("length"))} (slightly larger than a
[AA battery](/entry/tc-batt-aa)).
The 18650 cell has been used since the late 1990s and has been popular for a wide range of applications that
require a rechargeable battery - such as flashlights, laptops, power tools, and even electric vehicles. Due
to the popularity of the 18650 cell, they are usually an easily available, well-understood, and affordable
option.

18650 cell

TechConcept

A battery's capacity is the amount of electric charge it can deliver at the rated voltage. As individual batteries can vary significantly, a nominal capacity is usually given.

Battery Capacity (minimum)

Battery Capacity (typical)

The diameter is a measurement or specification of the distance across a circular or spherical shape (specifically, the length of a straight line passing through the center and connecting two points on the circumference).

Diameter

Lists known parts of this tech concept, product, or instance.

Has part

This product is an instance of this more general tech concept.

Is a

When this product/part was first commercially available.

Launch Date

The length is a measurement or specification of the size of an object, usually as measured along its longest major axis.

Length

The quantity of matter in a physical body, which directly affects how heavy something is. Often called "weight", though the technical definition of weight is different.

Mass

Nominal voltage is the value assigned to an electrical component or system to indicate its typical voltage. The actual voltage that the component or system operates at may vary significantly from the nominal voltage.

Nominal Voltage

The UL file number can be used to look up the listing of a product with UL, a global safety certification organization.

UL File Number

Voltage Range

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Is a	TC18650 cell
Has part	TCJelly roll
Launch Date	2012
Diameter	18.45 mm^(), 18.5 mm^()
Length	65.13 mm^(), 65.3 mm^()
Battery Capacity (minimum)	3250 mAh^(*)
Battery Capacity (typical)	3350 mAh^(*)
Nominal Voltage	3.6 V
Voltage Range	2.5 - 4.2 V
Mass	47.5 g
UL File Number	`MH12210`