"A battery by definition is a collection of cells. So the cell is a little can of chemicals. And the challenge is taking a very high-energy cell, and a large number of them, and combining them safely into a large battery." Contact online >>
"A battery by definition is a collection of cells. So the cell is a little can of chemicals. And the challenge is taking a very high-energy cell, and a large number of them, and combining them safely into a large battery."
As a general rule, all 18650 batteries are not the same. The 18650 batteries are built differently according to specific uses and voltage. Therefore, there are different types from which you can choose.
The 18650 battery cells differ in their sizes, voltage capacity, charge and discharge rate, and other specifications. The reason why they are not built equally is for you to have choices to match your electric bike''s requirements.
On the other hand, unprotected 18650 batteries do not have a protective electronic circuit. It means unprotected 18650 batteries are prone to overcharging, over-discharging, and short circuits.
However, unprotected 18650 batteries are cheaper than protected 18650 batteries.
Most people say unprotected 18650 battery cells are more suitable for building 18650 battery packs for electric bikes. But, the packs should use BMS and other protective components. Though protected 18650 batteries are safer, they are not suitable for every device.
In buying 18650 batteries, device "suitability" is a must.How Many 18650 Do I Need For 48V?
In total, thirteen 18650 battery cells are needed in a series connection for 48V. The nominal voltage of 18650 lithium-ion battery cells is 3.7V. So, to compute the number of cells required, divide 48V by 3.7V.
To attain the 48V, you need to use thirteen 18650 battery cells connected in a series. These 18650 battery cells should have the same nominal voltage.
So, you have to attach the first cell''s positive terminal to the next cell''s negative terminal and so on with the next cell. This battery pack is called 13S1P because there are 13 cells in the series connection and one cell in parallel.
If you target a specific aH for your battery pack, you must work on your parallel connection. For example, if you have 18650 battery cells with 3.7V and 2.6aH each and want to create a battery pack for 48V and 20aH, you need thirteen 18650 cells in each series to attain 48V.
To compute the number of cells for 20aH, divide 20aH by 2.6aH. With that, you need eight cells in each parallel connection.
To get the total number of 18650 battery cells for 48V and 20ah, multiply the number of cells required in the series to the number of cells needed in parallel. So, 13*8 is 104. Thus, you need one hundred and four 18650 battery cells for a 13S8P battery pack with 48V and 20aH.
Let me show you another example:
7.0V and 6.0aH battery pack from Samsung 18650-30Q battery cells (Nominal Voltage= 3.6V; Nominal Capacity= 3.0aH)
For 6aH, divide six by 3aH. Hence, you need two Samsung 18650-30Q cells in each parallel connection.
To get the total number of battery cells required for the 7V and 6aH battery pack, multiply the number of cells needed in the series to the number of cells required in parallel. Thus, you will need 4 Samsung 18650-30Q battery cells for your battery pack. The pack is called 2S2P.
Always remember to buy protective components for your battery pack.Are 18650 Batteries Banned?
As a general rule, 18650 Batteries are not Banned. However, Consumer Product Safety Commission (CPSC) warns the consumers not to use or buy loose 18650 battery cells. Unfortunately, this warning causes some people to believe that 18650 batteries were banned.
18650 and other batteries are dangerous and destructive if not handled and used correctly. That is why battery manufacturers provide a manual on safety precautions for handling batteries.
Loose battery cells may have exposed positive and negative terminals. As a result, a short circuit might occur if these terminals contact metal or conductive objects. Short circuits can cause fire, explosion, and physical injuries.
On January 08, 2021, CPSC released a warning for consumers not to use loose 18650 lithium-ion battery cells.
CPSC issued this warning after receiving reports of incidents of fire, explosion, and injuries due to improper usage of 18650 batteries. Check the CPSC newsroom to know more about the warning.
The 18650 battery cells that are unprotected should not be used as a standalone battery. Instead, manufacturers usually use these unprotected 18650 battery cells in building battery packs.
However, some retailers and sellers tend to separate every single cell in battery packs and rewrap and sell them as new batteries.
There have been loose 18650 battery cells sold on different e-commerce platforms. With that, CPSC coordinated with these platforms (Amazon, eBay, Walmart, etc.) to delete the listings of loose 18650 battery cells.
Dealers and sellers should not sell these 18650 battery cells unless protected.
"Safety first is safety always."
When you charge your battery, it is an excellent choice to have a charging timer for you to keep track of the hours left e a suitable charger for your 18650 battery. When charging, do not leave your 18650 battery unattended.
It is essential to keep an eye on your charging 18650 battery to ensure that there will be an immediate response if a hazard occurs unexpectedly.
If you cannot monitor your 18650 battery while it''s charging, wait for a period of time when you can watch it before you attempt to charge it. This can prevent a potentially unfortunate event from occurring.
Metal elements are good conductors of heat and electricity. A short circuit might occur if a 18650 battery comes in contact with a metal or any conductive object. Therefore, placing your 18650 batteries in a battery case or their original packaging is always better.
These steps apply not only to 18650 batteries but also to all other kinds of batteries as well. To learn more about the safety precautions of your battery, always refer to your battery''s manual.
As a whole, 18650 battery cells are equivalent to 21700 batteries. These batteries are both made from lithium-ion batteries but are produced in different sizes.
The 18650 batteries are similar to 21700 batteries. The typical nominal voltage capacity of these batteries is 3.6V/3.7V. However, their sizes are different.
The 21700 batteries are 21mm X 70mm in size, while the 18650 batteries are 18mm X 65mm in size. When choosing between the two, use the battery size that fits your electric bikes.
As a general rule, you can use 21700, 20700, and 26650 batteries instead of 18650 batteries. These batteries are all made from rechargeable lithium-ion battery cells. As a result, you can use them interchangeably in certain circumstances.
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