18650 battery sizes and Types-Introduction and Types

An 18650 battery is simply a lithium rechargeable battery. The 18650 battery, or 18650 cell, which is their proper name, has between 1800 mili-amp-hours and 3500 mili-amp-hours (mAh), with voltage of 3.7v. 

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18650 batteries may have a charging voltage of 4.2v or a voltage range between 2.5v and 4.2v. The minimal voltage of any standard 18650 cell is 3.7 volts. 

Basically, there are two types of 18650 cell, namely the protected and the unprotected. Protected cell 18650 batteries are usually recommended. These cells typically include a protection circuit, which stops the battery from being overcharged. Unprotected 18650 batteries can be overcharged and this may cause them to buts. This may potentially cause even a fire if the cell is not protected by specific electronics. The popular Samsung 25r and LG HG2 are unprotected batteries. These batteries should only be used a device that is designed to use unprotected cell 18650s. It is also recommended that you insist on using high quality brand name cell 18650s. This is because nock offs might sometimes lie about mAH. 

The charge time may vary with voltage and amperage of the battery type and the charger, but the average cell 18650 charge time is usually 4 hours. 

18650 batteries are used in a several electronic devices that we commonly use in our homes and offices. Specifically, these batteries are used in laptops, vaping, electronics, and flashlights. They are also used in some electric vehicles. For example, the 7180 of these batteries is used in the Tesla. Fenix PD35 or Thrunite TN14 and many other high lumen flashlights use the 18650 batteries or even the larger 21700 cells. 

Vaping, laptops and other electronic devises usually use one of more 18650 batteries and come with in-built recharging electronics. 

18650 batteries are basically Lithium Ion batteries. For those who have knowledge if electronics, changing out some battery packs manually may be an easy task. However, you should be very careful because using 18650 incorrectly or using the wrong type can cause fire. 

18650 battery Different Sizes 

18650 battery comes in many sizes. For instance, the 18650 battery is 1170 cubic mm, while the 14500 and AA are usually 700 cubic mm. There is also the AAA, which is 467 cubic mm. It is important to mention that the 14500’s cannot actually be used in all AA. Actually, they can only be used in AA devices that support both 1.5 and 3.7 volt batteries. The 18650 battery is smaller than the 21700 battery at 1550 cubic mm – the 18650 and 21700 is not interchangeable. 

As already been mentioned, the 18650 batteries are also available in various styles and sizes. At the moment, the Do 18650 battery sizes can vary from manufacturer to manufacturer. However, most manufacturers are producing their batteries as per the battery industry recommended standardized size. The battery industry is pushing to ensure that the 18650 battery size is standardized. Presently, these batteries are generally between 3.6 and 3.7 volts. They generally have various milliamp (mAh) ratings. 

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It should be noted that the mAh or milliamp rating is exclusively for determining how often the battery will have to be recharged. The higher the milliamp rating the, the longer the time the battery will take to run between charges. Based on a general observation, these batteries are not actually designed to operate or work in temperatures that are below freezing points. 

What are the Different Types of 18650 Batteries?

18650 Batteries come in different types. In fact, there are just as many types of these batteries as there are uses. Actually, this type of battery are some of the most known versatile batteries in the market today. These batteries are used in various capacities to power digital cameras, electric cars, and just about anything.

First, we have already mentioned that there are protected 18650 batteries and unprotected 18650 batteries. Protected ones are those that have an electric circuit, which is embedded in the battery casing or cell packaging. The circuit protects these batteries from over charge, over discharge, or over heat. The circuit also protects these batteries from short circuit and over current. A protected 18650 battery is generally safer as compared to an 18650 unprotected battery. The protected type is less likely to overheat, start on fire or burst. Talking of shape, the protected ones typically have a “button top”. 

Unprotected 18650 cells usually have a flat top and they lack the protection circuit. They are usually cheaper as compared to their protected counterparts. These types of 18650 cells should only be used in instances where the charging and draw/load is extremely controlled and monitored. 

The 18650 is not actually a standardized battery. They are not all built equally. They are also not all built to perform a specific task. So, when purchasing 18650 batteries, the most important feature to consider is the CDR or the continuous discharge rating. CRD is also referred to as amperage capacity. 

For starters, continuous discharge rating is the rate at which the current can successfully be pulled from the cell without it overheating. When trying to find the type of 18650 cell that is right for you, you should match the CDR of the cell with the power draw that is associated with your device. 

Electric cars like the Model S and Tesla Model X, is what is known as battery electric vehicle, aka BEV. These cars are typically powered by a pile of ion batteries all working together. For example, the type of battery that powers the Model S is a battery pack that contains more than 7,104 18650 cells. The pack of cells can store up to about 85 KWh of energy. Just recently, Tesla engineers successfully redesigned a new cell pack that their electric cars will use. The new battery pack holds 516 cells in every module for a sum of 8,256 cells that can store more energy – a little more than 100 kWh. With such capacity, these electric cars now have a maximum range of more 300 miles on just a single charge.