Samsung smartphones come with lithium-ion batteries, which you should charge regularly. However, if you leave your battery dead for an extended period, you should fully charge it and then use your smartphone until the battery is fully discharged. Repeat this cycle twice more. After 3 cycles the battery should operate at peak performance again.
Many factors affect the length of time the battery can operate before recharging, such as the amount you use it, the applications that are running, the brightness of the screen and even the volume of your ringer.