Can I use the HyperJuice battery to power up and use my iPhone when its battery is empty? Shirley June 20, 2013 22:18 No, instead HyperJuice battery will recharge your IPHONE to a certain power level, then you can start to turn it on. Related articles Can I charge the HyperJuice external battery world wide? How long should I charge my new HyperJuice battery? Can the HyperJuice for MacBook battery recharge MacBook's internal battery? Can I use HyperJuice battery with my Apple PowerBook G4 and other non-MacBook laptops? How to use the Pre-Modified Magsafe Adapter Comments 0 comments Please sign in to leave a comment.