^^^ You're right, but the numbers were 20-80%. Mophie recommended using the juicepack between 20-80%. Apparently it takes more energy to charge from 80-100% and up to 20%. Location services, total apps running, and screen brightness are the biggest factors it seems. I really think Apple could do better on their batteries and power efficiency as well as the quality control and consistency of the batteries themselves.
"...it's the quiet cool...it's for someone who's been through the struggle and come out on the other side smelling like money and pussy."
"put her in the taxi, put her number in the trash can"