The full-sized (5200 mAh) Helix Juice box will give similar runtimes to Anton Bauer batteries. The estimated runtime of the Juice Box is about 4 hours when powering just the Helix. When powering a camera in addition to the Helix, you can expect about 1 hour of runtime (based on the Red Epic in idle mode). The Helix Jr. Juice Box is half the weight and half the capacity of the full-sized Juice Box.
Users of the full-sized Juice Box have commonly reported battery lives of 25 to 45 minutes per charge when actually shooting with a RED, depending on the number and type of accessories they are powering with it.