Believe it or not, Juice Pack Plus ($120) is actually the third all-but-identical iPhone 5 battery case in Mophie's extended rollout of the line. As the name suggests, it offers a larger capacity battery than either Juice Pack Helium or Juice Pack Air; this one is packing 2100mAh, and Mophie claims that it offers up to 120% battery life -- our prior tests suggest that it'll come in considerably lower than that. Physically, it looks a lot like the…
