Lithium ion battery
Rechargeable cylindrical lithium-ion batteries include many different models, such as 18650, 14650, 14500, 10430, 18350, 21700, 26650, 32650, etc. At present, the 18650 battery is still the most widely used. The 18650 is 65mm in length and 18mm in diameter. Cylindrical battery with a capacity from 800mAh to 3500mAh. The commonly used ratios are 1C and 3C. The power battery above 3C has a large working current. It is suitable for electric vehicles, garden tools, electronic cigarettes and other fields.
Lithium batteries are the same as 3.7V or 4.2V. 3.7V refers to the platform voltage (nominal voltage) at which the battery is discharged during use. The battery has the slowest voltage drop when discharging at 3.7V, while 4.2V refers to the highest voltage when fully charged. Common rechargeable 18650 lithium batteries, the voltage is standard 3.6 or 3.7v (the voltage will be different due to different material ratios), when it is fully charged, it is 4.2v, which has nothing to do with the capacity, the mainstream capacity of 18650 batteries 1800mAh to 2600mAh, (18650 power battery capacity is mostly 2200~2600mAh)
Most lithium batteries cannot be discharged below 2.7V, otherwise excessive discharge will damage the battery. 4.2V is the highest voltage for battery charging (there is also a high-voltage lithium battery 3.8V that can be charged to 4.35V), under normal conditions Charging the lithium battery to 4.2V is full. In the process of charging the battery, the voltage of the battery gradually rises to 4.2V. The lithium battery cannot be charged above 4.2V, otherwise it will damage the battery, which is also lithium ion Special place for battery.
Therefore, most lithium battery packs will be equipped with a protection board (PCB), which integrates multiple protection functions such as overcharge protection, over discharge protection, over current protection, over temperature protection, short circuit protection, etc
The life of the 18650 battery is related to the ratio of the materials used. Theoretically, the maximum cycle charge can reach 1000 times. However, due to overcharge, over discharge, and high current discharge during use, these conditions will shorten the life of the battery. In addition, , Because the 18650 has a very good stability at work, it is widely used in various electronic fields: commonly used in high-end glare flashlights, electric clothing, shoes, LED lighting equipment, medical equipment, electric vehicles, garden tools, etc.
Inr18650 A grade Lithium Li Ion 3.7V Battery Cell 2900mah Capacity 29E Samsung SDI
18650 Lithium Ion Battery Cell 2000mAh 3.7V Flat Top
