Compared with other types of batteries, it has a higher safety performance. It will basically not explode or burn in use and will not have toxic and side effect. Various safety performances are completed at one time, with cycles for more than 500 times. Moreover, it is very high temperature resistant. In order to prevent short circuits, we generally seperate the positive and negative electrodes of the 18650 lithium-ion battery. Therefore, the possibility of short circuits has been reduced to the limit. A protection board can be installed to prevent overcharge and overdischarge of the battery and prolong the service life of the battery.