Power tool lithium battery should choose 18650 lithium battery or 21700 lithium battery

The rapid development of the lithium battery industry in recent years has promoted the changing development of various industries, except for the electric vehicle products that we often pay attention to. The power tools used in daily life are increasingly inseparable from lithium batteries. At present, most electric tools still use 18650 lithium batteries as the main power source, but with the advent of 21700 lithium batteries, this situation is gradually being broken. Whether to choose 18650 or 2170021700, 18650, 20700, etc. for power tool lithium batteries only refers to the physical size of lithium-ion batteries. For example, 18650 lithium battery, 18 represents the circumference, 65 represents the length, and 0 represents the cylindrical battery. The 18650 battery is not only a lithium battery, but also a NiMH battery in the size of 18650. Compared with the 18650 battery, the extra 5 mm length and 3 mm diameter of the 21700 cells can increase its volume by 47%. This also means that an additional 7,700 cubic millimeters of space can be used to fill the anode, cathode and electrolyte materials that transfer energy. It also means that the 21700 lithium battery can have a higher capacity than the 18650 lithium battery. Higher capacity means longer battery life. Compared with 21700 and 18650, the most obvious benefit is that the additional volume space allows it to have more energy to make your tools run longer. We see that the battery that uses 18650 cells as power has a capacity of 1.5Ah (1500mAh) to 3.0Ah (3000mAh). However, high-end 18650 cells (3.0Ah) have already experienced batch problems, which is why most manufacturers put 2.5Ah (2500 mAh) cells in the first place. On the other hand, for power tool batteries, the starting point of 21700 cells is 3.0Ah (3000mAh), and the highest can reach 4.0Ah (4000mAh). This is why we can see that compact (1P) battery packs can be labeled 3Ah or 4Ah, up to 12Ah (3P) large batteries. The following is a comparison of the capacity of conventional power tool batteries. 18650 compact 1P battery: 2.0Ah3.0Ah (36 Wh54 Wh) Universal 2P battery: 4.0Ah6.0Ah (72 Wh to 108 Wh) Large capacity 3P battery: 9.0Ah (162Wh) 21700 compact 1P battery: 3.0Ah4.0Ah (54 Wh72Wh) Universal 2P battery: 6.0Ah8.0Ah (108 Wh144 Wh) Large capacity 3P battery: 9Ah12Ah (162 Wh216 Wh) *Note: The above does not matter the nominal voltage of the battery. How to choose between 18650 lithium battery and 21700 lithium battery. 18650 lithium battery has been one of the lithium batteries used in power tools for a long time. In addition to the appropriate size, the weight is also more suitable for carrying. 21700 has a larger size space than 18650, and it also has heavier weight and larger volume than 18650. However, it is obvious that 21700 can provide more powerful power and longer service life at the same time. If it is necessary to make a trade-off between the two batteries, more attention should be paid to practical applications. Both batteries can be used for power tools. How to choose and match is not difficult. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: The cordless trend of power tools will greatly increase the installed capacity of lithium batteries