2 Pieces 3.7v Rechargeable Battery

18650 li-ion battery has the following outstanding features: 18650 lithium battery capacity is generally , while the general battery capacity is only about. When combined into a 18650 lithium battery pack, the total capacity of 18650 lithium battery pack can casually break 5000mAh.  18650 lithium battery life time is very long, normal use cycle life of up to 500 times, which is more than twice of other normal batteries. 18650 li-ion battery has high temperature performance, discharge efficiency of 65% under the conditions of 100%. In order to prevent short-circuit the battery, 18650 lithium battery is separated. So it may have short-circuit phenomenon has been reduced to the extreme. You can install a protective plate to avoid overcharging the battery over discharge, so that it can also extend the battery life.  18650 lithium battery voltage are generally 3.2V, 4.2V and 4.35V, much higher than the nickel-cadmium and nickel-metal hydride batteries 1.2V voltage.