It depends how much you vape and the size of your battery. Typically, a Liberty Flights Premier Starter Kit battery (650 mAh) lasts all day before needing a charge or 5-6 hours of use. A full recharge usually takes 2 hours. A larger 900 mAh battery should last a day and half. You should disconnect the battery from the USB charger when the light on the charger turns green to maximize the lifespan of the battery.