18650 battery is the originator of the lithium-ion battery – the Japanese SONY company in order to save costs and set a standard lithium-ion battery model, 18 means the diameter of 18mm, 65 means the length of 65mm, 0 means for the cylindrical battery.
18650 is the most widely used secondary battery in the market, we use 18650 batteries in many electrical appliances, such as electric toys, electric toothbrushes, lamps, laptops, walkie-talkies, portable DVDs, instruments, audio equipment, models, toys, video cameras, digital cameras and other electronic devices.
#1-What Is the Voltage of 18650 Battery?
Common 18650 batteries are divided into lithium ion batteries and lithium-ion phosphate batteries. Lithium-ion batteries have a nominal voltage of 3.7V and a charge cut-off voltage of 4.2V, while lithium iron phosphate batteries have a nominal voltage of 3.2V and a charge cut-off voltage of 3.6V, with a capacity of 1200mAh-3600mAh and a common capacity of 2200mAh-2600mAh. Generally, 2.8V is used as the discharge cut-off voltage. The voltage of cylindrical lithium batteries for torches is generally common, so there is no need to pay attention to voltage parameters.
#2-What Is the Capacity of 18650 Battery?
Capacity is one of the important indicators of lithium batteries, the higher the capacity of the same type of lithium battery, the longer the range. 18650 lithium battery capacity is generally between 1200mah-3600mah, the current market 18650 lithium battery capacity can reach 3600mAH, while the general battery capacity is only about 800mAh, if the combination of 18650 lithium battery into 18650 lithium battery pack, that 18650 lithium battery pack casually can break through 5000mah.
Usually the manufacturer will print the capacity and other parameters on the battery cover, but most of the batteries are not printed on any parameters, at most printed a model number. The only way to get the true capacity of a battery is to measure it yourself. Another point to note is that the actual discharge capacity of the battery is related to the current, internal resistance and environment, the manufacturer’s nominal capacity value is measured by 0.2C small current discharge (e.g. 3500mAH battery with 0.7A discharge test).
#3-What Are the Advantages of 18650 Batteries?
①Small internal resistance: The internal resistance of 18650 battery is smaller than the general liquid battery cells, which greatly reduces the self-consumption of the battery and prolongs the use time, this kind of polymer lithium battery which supports large discharge current is ideal for RC models and becomes the most promising alternative to NiMH batteries.
②No memory effect: no need to empty the remaining power before charging, easy to use.
③High voltage: The voltage of 18650 Li-ion battery is generally at 3.6V, 3.8V and 4.2V, much higher than the 1.2V of NiCd and NiMH batteries.
④High safety performance: 18650 lithium battery has high safety performance, non-explosive, non-combustible; non-toxic, non-polluting, certified by RoHS trademark; cycle times greater than 500 times; good high temperature resistance, discharge efficiency of 100% under 65 degrees. To prevent the short-circuit phenomenon of the battery, the positive and negative poles of 18650 lithium battery are separated. So the possibility of short-circuiting has been reduced to a minimum. A protection plate can be added to avoid overcharging and over discharging of the battery and prolong the service life of the battery.
⑤Long service life: 18650 lithium battery has a long service life, with a cycle life of 500 times or more in normal use, which is more than twice that of ordinary batteries.
⑥Large capacity: The capacity of 18650 lithium battery is generally between 1200mah~3600mah, while the general battery capacity is only about 800. Can be combined in series or parallel into 18650 lithium battery pack, if the combination of 18650 lithium battery to become 18650 lithium battery pack, that 18650 lithium battery pack is casually can break through 5000mah.
#4-What Are the Application Scenarios of 18650 Lithium Battery?
In the energy battery industry lithium secondary batteries are used thanks to their superior performance. With the continuous development of lithium secondary battery technology, it has been widely used in our daily life; rechargeable batteries for multiple use are increasingly favoured by consumers. At present, 18650 lithium batteries have certain applications in the following fields
① Energy storage category
Mainly used in base station power supply, clean energy storage, grid power storage, home light storage system, etc.
② Power class
Mainly refers to electric vehicles, electric bicycles, new energy vehicles, etc.
③ 3C digital category
Mobile phones, tablets, laptops, electric toys, MP3/MP4, headphones, rechargeable batteries, model airplanes, mobile power, etc.
#5-How to Store 18650 Batteries?
Lithium batteries do not require high environmental requirements for storage, long-term use is recommended to use a storage box in a cool and dry place. It is important to note that the voltage of the 18650 battery should be kept at the rated voltage, i.e. 3.2V-3.7V for long-term storage.
#6-What Is the Battery Charging Cycle of 18650 Lithium Battery?
The charge cycle of a battery is the total time required to fully charge and discharge. The cycle life reflects the life of the battery providing more than half of its capacity. For 18650 Li-Ion batteries, if using low current charging. This will help to extend the life of the 18650 Li-Ion battery.
Microcell International Battery Co.,Ltd is an enterprise with completely independent development and production capacity. With a united and professional elite team, it has gradually formed a high-tech enterprise integrating R&D, manufacturing, marketing and so on. For more knowledge about Li-ion batteries, please stay tuned to my article, I hope it can help you.
