to MiLi’s smart chip you can extend your overall iPhone battery life by using the iPhone's internal battery only when it's absolutely necessary. Leave your MiLi to charge and re-attach to the iPhone as needed. Just disconnect the iPhone from the MiLi and you will have a fully charged phone to take with you.With the MiLi PowerSpring 4 Extended Battery, you can enjoy your movies, music, phone calls and internet surfing without worrying about the iPhone battery running out! This portable charger can recharge your iPhone to 100% one and half times when the MiLi is fully charged! Email, surf, talk, text, call and play all you want with a trustworthy battery.ORDER TODAY FOR FREE SHIPPING & DISCOUNT OR GET ON THE "FIRST TO KNOW" LIST!Visit today!