High-performance 18650 cylindrical steel shell battery, single-capacity 2200mAh, long service life, can meet 500 cycles, exnt low temperature and high rate performance; good safety performance, PTC temperature protection and explosion-proof pressure relief valve, can be over temperature, The circuit is broken under the condition of excessive internal pressure to prevent the explosion of the battery core; the standard 18650 size can meet the needs of various types of electronic products