The Flex iPhone charger integrates a Powerful, High density lithium-ion Battery cell joined with an advanced chipset & electronics to give your iPhone the charge it needs. It can provide up to 150% additional iPhone power depending on your iPhone model. More than double your iPhone battery time to talk, text and use your favorite Apps. The PhoneSuit Flex is the first pocketable battery designed for daily use. The PhoneSuit Flex allows you to truly be mobile. It's so tiny it can fit in your jean pocket or a small clutch purse.