18650 battery pack is consists of series and parallel the 16850 battery, the battery requirements parallel each battery voltage are the same, the output voltage is equal to the voltage of a battery, the battery can provide more current shunt. Series battery is without excessive requirements.
As long as the battery capacity is almost enough, the series battery pack can provide a higher voltage.
18650 Battery Pack are widely used in our lives. TV remote controls, electronic toys, flashlights all have battery pack.
Battery pack has the advantage that individual Power Battery do not has. So that they are used widely.
