Does HyperJuice external battery have over-charge protection? Shirley June 20, 2013 22:26 Follow When the HyperJuice battery is fully charged, the voltage current will be set to trigger charge to protect the battery. Related articles English user manual for HyperJuice AC battery How do I know if the HyperJuice Micro/Mini is fully charged? When should it be recharged? How to use the Pre-Modified Magsafe Adapter Do I need a special cable to connect HyperJuice pure DC Car Charger with MacBook? Can I use the HyperJuice battery to power up and use my iPhone when its battery is empty? Comments 0 comments Please sign in to leave a comment.